Resolve #3525354 "Security advisory preparation"

Completely revamp the implementation of hooks to comply with up-to-date best practices.

Closes #3525354

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• 961284de - Fix problems with multiple warnings generated by phpcs.

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• 24220403 - Remaining fixes for the t() warning.

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• 4034a2dd - Fix a problem with the wrong path assigned in the use statement.

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• 90fc8a25 - Return an empty array at the help() function.

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• d5c24fa1 - Extend the tests being performed in the Gitlab pipeline.

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merged