ci: mirror ready-for-review label + SDK PR review gate workflows onto v8

[xxshubhamxx]

What is this about?

Follow-up to #57. Those PR-hygiene files were ported to main only, so PRs targeting the v8 release line (e.g. #59) never triggered the gates: GitHub evaluates pull_request workflows from the base branch / merge-commit copy, and v8 had none.

This mirrors all three files onto v8, byte-identical to main (same blob SHAs), so the two lines stay in sync:

• .github/PULL_REQUEST_TEMPLATE.md (blob 4a2540d)
• .github/workflows/ready-for-review-label.yml (blob 7166b09)
• .github/workflows/sdk-pr-review-gate.yml (blob adb7570)

The template is included so v8 PRs get the ## Release section auto-populated regardless of how GitHub resolves the template branch — the ready-for-review gate reads that section, so without it a v8 PR would fail the gate on "missing ## Release section."

Fork PRs (e.g. #55, #59): this repo accepts PRs from forks, where pull_request grants a read-only GITHUB_TOKEN. The gate still fails closed correctly (the require-label step is a plain exit 1), but label-removal and warning-comment actions will silently no-op on fork PRs. Making those work would require pull_request_target — deliberately not done here to keep the port faithful to browserstack-ruby-sdk and avoid running privileged in the base context.

Related Jira task/s

• N/A (CI tooling — v8 coverage gap from ci: port PR template, ready-for-review label + PR-review gate workflows from ruby-sdk #57)

Release (mandatory for every PR — required for the ready-for-review label)

Version bump: (required — tick exactly one)

• minor (backwards-compatible feature)
• patch (bug fix or other small change)

Release notes type: (optional)

• Other Improvement

Release notes (customer-facing): (optional but encouraged)

Release notes (internal): (required — engineer-facing; what actually changed / why)

• Mirrored the PR template, ready-for-review label workflow, and SDK PR review gate onto the v8 branch so PRs targeting v8 are gated the same as main (they were silently ungated after ci: port PR template, ready-for-review label + PR-review gate workflows from ruby-sdk #57 landed on main only).

Checklist

• Ready to review
• Has it been tested locally?

PR Validations

Run Tests: Comment RUN_TESTS to trigger sanity tests.

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