[No QA] Create reusable validateActor action (v2)

[roryabraham]

Explanation of Change

Creating reusable validateActor action to DRY up some GHA code.

Fixed Issues

$ #56233
https://github.com/Expensify/Expensify/issues/195693

Tests

Testing AdHoc builds before merge, live-testing the rest. Without Ready to Build label:

• https://github.com/Expensify/App/actions/runs/13165000432
• https://github.com/Expensify/App/actions/runs/13164983943/job/36742793756

With Ready to Build label:

• https://github.com/Expensify/App/actions/runs/13164964072/job/36742728970
• https://github.com/Expensify/App/actions/runs/13165016094

createNewVersion was also tested in E/App-Test-Fork (that was all we were set up to test so far). The workflow is still failing for unrelated reasons, but you can see that the actor validation worked: https://github.com/Expensify/App-Test-Fork/actions/runs/13191991711/job/36826500310 (note: this testing helped me catch a 🐛 that was in the code - trying to call a local action without actions/checkout first)

• Verify that no errors appear in the JS console

Offline tests

None.

QA Steps

None.

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
  • MacOS: Desktop
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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    • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
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• I verified that if a function's arguments changed that all usages have also been updated correctly
• If any new file was added I verified that:
  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
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• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
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• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

MacOS: Desktop

[melvin-bot]

@eVoloshchak Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[roryabraham]

The only difference between this PR and the previous one is that this step was moved to happen after the checkout. Trying to call a local action (i.e: path specified with uses: ./.github/actions...) before actions/checkout doesn't work