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

[kinyoklion]

Requirements

• I have added test coverage for new or changed functionality — N/A (CI workflow change only)
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions — N/A (CI workflow change only)

Related issues

• Same fix as launchdarkly/sdk-meta#429
• Root cause: launchdarkly/gh-actions#86 added permissions: pull-requests: read at the job level inside the reusable workflow

Describe the solution you've provided

Adds permissions: pull-requests: read at the workflow level in .github/workflows/lint-pr-title.yml.

A reusable workflow can only request a subset of the permissions the caller has granted. Since this caller had no permissions block, the reusable workflow's permission request could not be satisfied, causing every run to hit startup_failure.

Describe alternatives you've considered

The permission could be reverted in the reusable workflow instead, but that would remove a security improvement (least-privilege scoping) across all consumers.

Additional context

No product code is changed. The only verification needed is that the Lint PR title check on this PR itself passes rather than hitting startup_failure.

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

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Note

Low Risk
Low risk CI-only change that only adjusts workflow permissions to fix a startup failure; no product code or data handling is affected.

Overview
Fixes Lint PR title workflow startup failures by adding an explicit workflow-level permissions: pull-requests: read, allowing the called reusable workflow to request PR read access.

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