fix(repo): prevent integration tests from installing Core 3 packages

[jacekradko]

Summary

• Remove proxy: npmjs from @clerk/* packages in verdaccio.install.yaml so integration tests only install locally published Core 2 packages instead of resolving higher Core 3 versions from the npm registry

Context

After Core 3 was published to npm, the release/core-2 integration tests started failing because:

1. CI publishes Core 2 packages (e.g. @clerk/backend@2.33.0) to a local Verdaccio registry
2. Verdaccio restarts with verdaccio.install.yaml which proxies @clerk/* to npmjs.org
3. Test apps install @clerk/backend — pnpm resolves Core 3 (3.0.1) from npm since it's a higher version than the locally published Core 2 (2.33.0)
4. All integration tests fail because they run Core 3 code against Core 2 test fixtures

The fix mirrors what verdaccio.publish.yaml already does — no npm proxy for @clerk/* scoped packages. Non-clerk dependencies continue to proxy to npm normally.

Test plan

• Integration tests on this PR pass (they should install Core 2 packages from Verdaccio instead of Core 3 from npm)

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Latest commit: f67686e

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Mar 5, 2026 1:39am

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commit: f67686e