Add Selenium and Cucumber modules to list of test instrumentations to avoid running sample tests

[nikita-tkachenko-datadog]

What Does This Do

Adds Selenium module to the list of test instrumentations.

Motivation

Test instrumentations contain sample tests (that are not actual tests for the tracer, but rather fixtures that we use to verify that instrumentation works correctly).
These instrumentation modules need to be added to a special list: for the modules present additional configuration is done that excludes sample tests from being run.

Contributor Checklist

• Format the title according the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any usefull labels
• Don't use close, fix or any linking keywords when referencing an issue.
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, move, or deletion
• Update the public documentation in case of new configuration flag or behavior

Jira ticket: [PROJ-IDENT]

[datadog-datadog-prod-us1]

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 60.15% (-0.02%)

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