feat(graphql): add hasLinkedSentryLogin to Me type

[drazisil-codecov]

Summary

• Adds hasLinkedSentryLogin: Boolean! to the Me GraphQL type
• Resolver checks owner.user.sentry_user.exists() — confirms the SentryUser row actually exists rather than trusting the denormalized sentry_user_id text field on Owner
• Needed so Gazebo can show a deprecation notice to users who log in via Sentry (deprecation date: July 8, 2026)

For Calvin

This is the backend half. Gazebo needs to query me { hasLinkedSentryLogin } and show a deprecation banner when it's true — pointing users to reconnect via GitHub/GitLab/Bitbucket before July 8.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.89%. Comparing base (ee7a2b4) to head (568087d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/codecov-api/graphql_api/types/me/me.py	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1168      +/-   ##
==========================================
- Coverage   91.89%   91.89%   -0.01%     
==========================================
  Files        1325     1325              
  Lines       50860    50866       +6     
  Branches     1626     1626              
==========================================
+ Hits        46739    46742       +3     
- Misses       3815     3818       +3     
  Partials      306      306              

Flag	Coverage Δ
apiunit	94.94% <50.00%> (-0.02%)	⬇️

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[codecov-notifications]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/codecov-api/graphql_api/types/me/me.py	75.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (75.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

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[thomasrockhu-codecov]

nit, don't need to fix in this PR, there is a standard way of ordering imports. This shouldn't be in between codecov_auth. I don't have the PEP on hand, but again, don't have to fix now

[thomasrockhu-codecov]

I'm guilty of this too (see support pin), can we alphabetize these? Also nit, doesn't have to be this PR

[calvin-codecov]

I believe Owner.sentry_user_id is a slightly different concept from Sentry Auth login. I think what we may be looking for is the codecov_auth_sentryuser table that links to the User table while the sentry_user_id is for Sentry customer billing and plan purposes (Sentry pro plan)

[calvin-codecov]

I think using owner.user.sentry_user.exists() would be a better indicator