feat: migrate Admin Webhook APIs to connectRPC server

[whoAbhishekSah]

Migrate Admin Webhook RPCs to ConnectRPC server

The following RPCs are migrated.

• CreateWebhook
• UpdateWebhook
• DeleteWebhook
• ListWebhooks

The implementation of the handlers is similar to that of the gRPC handlers.
I have just made it compatible with the ConnectRPC signature.
We have used connect errors instead of gRPC errors.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
frontier	Ready	Preview	Comment	Sep 11, 2025 6:09am

[coveralls]

Pull Request Test Coverage Report for Build 17635647680

Details

• 0 of 108 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 31.8%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/api/v1beta1connect/webhook.go	0	108	0.0%

Totals
Change from base Build 17635117003:	-0.1%
Covered Lines:	10821
Relevant Lines:	34028

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💛 - Coveralls