feat: [PL-65024]: Adding examples for platform service entites (#1289)

* b31725 Merge remote-tracking branch 'origin/PL-65024' into PL-65024

* 05e59d #platform-core-framework-exmaples

* efc434 #platform-core-framework-exmaples

Author: akshat-goyal-harness

examples/data-sources/harness_central_notification_channel/data-source.tf

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+# Example of fetching a notification channel by identifier
+data "harness_central_notification_channel" "example" {
+  identifier = "email_channel"
+  org_id     = "my_org"
+  project_id = "my_project"
+}

examples/data-sources/harness_central_notification_rule/data-source.tf

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+# Example of fetching a notification rule by identifier
+data "harness_central_notification_rule" "example" {
+  identifier = "high_severity_rule"
+  org_id     = "my_org"
+  project_id = "my_project"
+}

examples/data-sources/harness_default_notification_template_set/data-source.tf

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+# Example of fetching the default notification template set
+data "harness_default_notification_template_set" "example" {
+  identifier = "default"
+  org_id     = "my_org"
+  project_id = "my_project"
+}

examples/resources/harness_central_notification_channel/import.sh

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+# Import account level Central Notification Channel
+terraform import harness_central_notification_channel.example <central_notification_channel_id>
+
+# Import org level Central Notification Channel
+terraform import harness_central_notification_channel.example <ord_id>/<central_notification_channel_id>
+
+# Import project level Central Notification Channel
+terraform import harness_central_notification_channel.example <org_id>/<project_id>/<central_notification_channel_id>

examples/resources/harness_central_notification_channel/resource.tf

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+resource "harness_central_notification_channel" "email_channel" {
+  name        = "Email Notification Channel"
+  identifier  = "email_notification_channel"
+  description = "Email channel for critical alerts"
+  org_id      = "my_org"
+  project_id  = "my_project"
+
+  # Email channel configuration
+  email_config {
+    recipients         = ["[email protected]", "[email protected]"]
+    subject           = "[ALERT] Harness Notification"
+    send_to_all_admins = false
+  }
+
+  # Notification preferences
+  notification_method = "EMAIL"
+  enabled            = true
+
+  tags = {
+    environment = "production"
+    team        = "devops"
+  }
+}

examples/resources/harness_central_notification_rule/import.sh

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+# Import account level Central Notification Rule
+terraform import harness_central_notification_rule.example <harness_central_notification_rule_id>
+
+# Import org level Central Notification Rule
+terraform import harness_central_notification_rule.example <ord_id>/<harness_central_notification_rule_id>
+
+# Import project level Central Notification Rule
+terraform import harness_central_notification_rule.example <org_id>/<project_id>/<harness_central_notification_rule_id>

examples/resources/harness_central_notification_rule/resource.tf

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+resource "harness_central_notification_rule" "high_severity_rule" {
+  name        = "High Severity Alerts Rule"
+  identifier  = "high_severity_alerts_rule"
+  description = "Rule for high severity alerts notification"
+  org_id      = "my_org"
+  project_id  = "my_project"
+
+  # Rule conditions
+  conditions {
+    type  = "PIPELINE"
+    event = "PIPELINE_START"
+
+    # Filter for high severity events
+    filter {
+      type  = "severity"
+      value = "HIGH"
+    }
+  }
+
+  # Notification channels to notify
+  notification_channels = [
+    "email_notification_channel"
+  ]
+
+  # Execution settings
+  enabled = true
+
+  tags = {
+    environment = "production"
+    team        = "devops"
+  }
+}

examples/resources/harness_default_notification_template_set/import.sh

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+# Import account level Default Notification Template Set
+terraform import harness_default_notification_template_set.example <harness_default_notification_template_set>
+
+# Import org level Default Notification Template Set
+terraform import harness_default_notification_template_set.example <ord_id>/<harness_default_notification_template_set>
+
+# Import project level Default Notification Template Set
+terraform import harness_default_notification_template_set.example <org_id>/<project_id>/<harness_default_notification_template_set>

examples/resources/harness_default_notification_template_set/resource.tf

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+resource "harness_default_notification_template_set" "default_set" {
+  name        = "Default Template Set"
+  identifier  = "default_template_set"
+  description = "Default notification templates for all events"
+  org_id      = "my_org"
+  project_id  = "my_project"
+
+  # Email template configuration
+  email_templates {
+    type = "PIPELINE_START"
+    subject = "[${var.env}] Pipeline Started: ${pipeline.name}"
+    body = <<-EOT
+    <!DOCTYPE html>
+    <html>
+    <body>
+      <h2>Pipeline Started</h2>
+      <p><strong>Pipeline:</strong> ${pipeline.name}</p>
+      <p><strong>Triggered by:</strong> ${pipeline.triggered_by}</p>
+      <p><strong>Start Time:</strong> ${pipeline.start_time}</p>
+      <p>View details: <a href="${pipeline.execution_url}">${pipeline.execution_url}</a></p>
+    </body>
+    </html>
+    EOT
+  }
+
+  # Slack template configuration
+  slack_templates {
+    type = "PIPELINE_SUCCESS"
+    message = "✅ *${pipeline.name}* succeeded!\n*Environment*: ${env.name}\n*Duration*: ${pipeline.duration}\n<${pipeline.execution_url}|View Details>"
+  }
+
+  # Default settings
+  is_default = true
+
+  tags = {
+    environment = "production"
+    team        = "devops"
+  }
+}
+
+# Output the created template set details
+output "created_template_set" {
+  value = harness_default_notification_template_set.default_set
+}