Add external ID retrieval to Event class and adjust action priorities

[rubycalling]

Description

Introduces the addition of an external ID to user data, aligning with the best practices outlined in the Facebook Marketing API documentation.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• I have commented my code, particularly in hard-to-understand areas.
• I have confirmed that my changes do not introduce any new PHPCS warnings or errors.
• I have checked plugin debug logs that my changes do not introduce any new PHP warnings or FATAL errors.
• I followed general Pull Request best practices. Meta employees to follow this wiki.
• I have added tests (if necessary) and all the new and existing unit tests pass locally with my changes.
• I have completed dogfooding and QA testing, or I have conducted thorough due diligence to ensure that it does not break existing functionality.
• I have updated or requested update to plugin documentations (if necessary). Meta employees to follow this wiki.

Changelog entry

• Added support for external ID in user data to enhance integration.

Test Plan

Ensured that the external ID is correctly appended to user data without affecting existing functionality.

Screen.Recording.2025-04-16.at.18.36.42.mov

[facebook-github-bot]

@rubycalling has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@rubycalling has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@rubycalling has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

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