feat(backend): Add webhooks endpoints to the Backend API client

[tmilewski]

Description

Adds webhooks endpoints to the Backend API client.

  import { createClerkClient } from '@clerk/backend';

  const clerkClient = createClerkClient(...);
  await clerkClient.webhooks.createSvixApp();
  await clerkClient.webhooks.generateSvixAuthURL();
  await clerkClient.webhooks.deleteSvixApp();

ECO-593

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 7a4290f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 11 packages

Name	Type
@clerk/backend	Minor
@clerk/agent-toolkit	Patch
@clerk/astro	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/remix	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch

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Name	Status	Preview	Comments	Updated (UTC)
clerk-js-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 14, 2025 4:22pm

[Copilot]

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

packages/backend/src/api/endpoints/WebhookApi.ts:18

• [nitpick] Consider verifying the consistency of endpoint path naming. The endpoints for creating and deleting use 'svix' while this method uses 'svix_url'; aligning the naming convention might improve clarity.

path: joinPaths(basePath, 'svix_url'),