Core: Undo AST main.js check in validateConfigFile

[yannbf]

Closes #20940

What I did

#20802 introduced unintended side effects, and the check will be moved into an automigration.
For now, we remove the code which is causing breakage.

How to test

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

[socket-security]

Socket Security Pull Request Report

Dependency issues detected. If you merge this pull request, you will not be alerted to the instances of these issues again.

⚠️ Uses eval

Package uses eval() which is a dangerous function. This prevents the code from running in certain environments and increases the risk that the code may contain exploits or malicious behavior.

Avoid packages that use eval, since this could potentially execute any code.

Package	Eval Type	Location	Source
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