[FR] Add GH workflow to trigger remote validation

[brokensound77]

Taking advantage of #3281, we can add a GH workflow to trigger when a label is added and be able to run remote validation on a PR against every rule being changed (ES|QL or EQL only).

• for PR targeting main, trigger on label: remote-validate (or similar)
• parse the git diff and extract rules added or modified
• filter to ES|QL and EQL rules
• run the code against the list of rules

Dependencies:

• existing, pre-configured stack
• creds stored in GH secrets (envvar to point to those creds)

[brokensound77]

actually, I think a better option would be to trigger it with a comment on keywords such as test: remote validate

[Mikaayenson]

I linked these to the two metas, as there is some overlap.

[botelastic]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[botelastic]

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