ci: grant pull-requests:read so lint-pr-title workflow starts

[kinyoklion]

Summary

Adds permissions: pull-requests: read at the workflow level in .github/workflows/lint-pr-title.yml. The reusable workflow at launchdarkly/gh-actions/.github/workflows/lint-pr-title.yml now declares permissions: pull-requests: read at the job level (per launchdarkly/gh-actions#86), and a reusable workflow can only request a subset of permissions the caller grants. Without an explicit permissions block in the caller, the called job fails with startup_failure.

Same fix as launchdarkly/sdk-meta#429, applied across SDK repositories.

Review & Testing Checklist for Human

• Verify the Lint PR title workflow run on this PR completes successfully (no startup_failure)

Notes

This is part of a batch fix applied to all SDK repos that use the reusable lint-pr-title workflow. No application code is changed.

Link to Devin session: https://app.devin.ai/sessions/c7b96da5c9074500aa684bc9a9ba1c31
Requested by: @kinyoklion

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Note

Low Risk
Low risk workflow-only change that only adjusts GitHub Actions permissions and does not affect application code.

Overview
Ensures the reusable lint-pr-title workflow can run on pull_request_target events by explicitly adding workflow-level permissions: pull-requests: read, preventing startup_failure due to insufficient caller permissions.

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