Implement safe_to_test label and update outdated github actions

[zinduolis]

Pull Request

Category

Core Functionality

Feature/Issue Description

Q: Please give a brief summary of your feature/fix
A: Hardens BrowserStack CI by requiring a safe_to_test label before running tests on PRs from forks. Upgrades outdated actions.

Q: Give a technical rundown of what you have changed (if applicable)
A:

• Workflow triggers only on labeled event, gated by safe_to_test label
• Label is auto-removed as the first step, requiring re-approval for subsequent runs
• Upgraded actions/checkout v4 → v6,
• Added actions/github-script v8,
• Maintainers must add the safe_to_test label after reviewing PR code. The label is consumed on use and must be re-added for each test run. Create the label in Settings → Labels.

Test Cases

Q: Describe your test cases, what you have covered and if there are any use cases that still need addressing.
A:

• Workflow does not trigger without the label
• Label is removed before secrets are accessed
• New commits require label to be re-added

Wiki Page

N/A