fix(mandatory-scope-binding): flag potential invocations only

[kireevmp]

Previously mandatory-scope-binding over-flagged every EventCallble & Effect reference (specifically, Identifier) it found in a component without regard to its usage – it even erroneously flagged function arguments. But the essence of the rule has always been to prevent Scopeless calls, so this PR significantly improves (narrows down) the search.

Only direct or transitive (via an unknowing consumer) invocations actually risk bypassing Scope binding. So the rule now matches at four specific "boundary" positions + analyzes actual usage.

There's now also a "delegation contract" exception. We now allow passing a Unit to a callee within React jurisdiction whose declared argument type explicitly guarantees it's is aware the argument is a Unit. The rule assumes that the receiver is itself bound by the very same rule and "delegates" scope binding to that receiver.

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