Fix: EventFake does not match Event:listen

[pandiselvamm]

This PR fix this issue #54878

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[taylorotwell]

We never document this syntax.

[Sophist-UK]

@taylorotwell

If you read #54878, you will see that @pandiselvamm has plagiarised my code and submitted a PR in his name without providing sufficient description and justification and without even bothering to credit my efforts.

Nevertheless...

1. The existing code is clearly trying to match different syntaxes which effectively are the same event listener relationships in order to achieve what this PR is attempting to make work comprehensively, but the existing code is buggy. If you read EventFake does not match Event:listen documentation - both need fixing #54878, I provide a comprehensive set of tests that exhaustively demonstrate all the times this normalisation doesn't work.

2. What syntax was "never documented"? The class@method syntax? If you read the code of this PR you will see that this syntax is already in use in e.g. the existing EventFaker test cases.

3. Even if the syntax was never documented, it works in other places in the code, so for consistency it should also work here.

4. Even if you don't want to fix the undocumented syntax here, this PR also fixes OTHER issues with the documented syntax.

5. The code that exists here is actually smaller and more compact than the existing code, and therefore it doesn't contribute to code growth and has LESS code to maintain.