chore(repo): Allow WebFetch for Sentry docs in Claude settings

[github-actions]

Note

The pull request "chore(repo): Allow WebFetch for Sentry docs in Claude settings" was created by @philipphofmann but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

Adds WebFetch permissions for docs.sentry.io and develop.sentry.dev to Claude Code settings, enabling Claude to fetch documentation content directly from Sentry's official documentation sites.

This follows the same pattern used in the sentry-cocoa repository.

[linear]

JS-1508