action: remove unused action

[v1v]

Proposed commit message

See title

This action has never been used and it contains a few security issues that semgrep reported, https://semgrep.dev/r?q=yaml.github-actions.security.run-shell-injection.run-shell-injection

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Author's Checklist

• [ ]

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[botelastic]

This pull request doesn't have a Team:<team> label.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @v1v? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2023-08-31T21:05:02.681+0000

• Duration: 16 min 35 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

💚 Flaky test report

Tests succeeded.

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