[Issue] improve NonComposerComponentRegistration

[m2-assistant]

This issue is automatically created based on existing pull request: #28975: improve NonComposerComponentRegistration

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Description (*)

Magento 2.4-develop
enable strict mode and added typeHint, this changes make execution of code more secure.
remove useless assignation $main.

Expected behavior (*)

Benefits

Additional information

Manual testing scenarios not necessary, if CI passes this code is good, it's only technical improvement.

[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
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