fix: checkout actions repo when called from Core or Pro [ED-25263]

[Svitlana-Dykun]

Summary

• Reusable workflow github.event_name is the caller event (workflow_dispatch from Pro), so checkout used Pro's tree and ./.github/actions/install-deps was missing.
• Checkout this repo when github.repository is elementor/elementor-editor-github-actions; otherwise clone it at actions_ref.
• Failed run: https://github.com/elementor/elementor-pro/actions/runs/34816719992

Test plan

• Merge this, then re-run Pro Post-Release Check (same dispatch). Verify job should check out elementor-editor-github-actions and get past Install Dependencies.
• Dispatch Post-Release Check on this repo itself still checks out the current repo.

Made with Cursor

✨ PR Description

1. Problem & Context

Fixes ED-25263 where using github.event_name == 'workflow_call' failed to trigger the correct repository checkout because the context refers to the caller's event.

2. What Changed (Where)

• .github/workflows/post-release-check.yml: Replaced event-based checkout logic with github.repository checks.
• actions/post-release-verify/README.md: Documented the change in event context behavior.

3. How It Works

The workflow now checks if the current execution repository is the actions repo itself; if not, it explicitly checks out the elementor-editor-github-actions repository to ensure necessary scripts are available regardless of the trigger event.

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