ci: fail gRPC coverage check on missing queries, remove PR comment

[thepastaclaw]

Option A (alternative to #3136)

Simplify the gRPC coverage workflow:

• Let the Python script's exit code drive pass/fail directly (fails if any new queries are missing)
• Remove the PR comment step entirely — coverage report is available as a build artifact
• Drop pull-requests: write permission (no longer needed)

This solves the fork PR failure since no comment is attempted. Also makes the workflow simpler — missing coverage shows up as a red CI check rather than a comment.

Validation

What was tested:

• Check gRPC query coverage CI workflow — validates that the Python script exit code correctly gates coverage enforcement
• Fork PR simulation: confirmed no pull-requests: write permission errors occur since comment step is removed

Results:

• Check gRPC query coverage — pass (10s, GitHub Actions CI)
• Build JS packages / Build JS — pass (11m11s)
• JS dependency versions check — pass
• Rust crates security audit — pass
• All other applicable CI checks passed

Environment: GitHub Actions CI (ubuntu-latest)

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[thepastaclaw]

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[PastaPastaPasta]

this is my preferred between the two PRs

[PastaPastaPasta]

I think this makes sense