[compiler][poc] Reuse ValidateExhaustiveDeps for effect dep validation

[josephsavona]

Alternative approach to #35282 for validating effect deps in the compiler that builds on the machinery in ValidateExhaustiveDependencies. Key changes to that pass:

• Refactor to track the dependencies of array expressions as temporaries so we can look them up later if they appear as effect deps.
• Instead of not storing temporaries for LoadLocals of locally created variables, we store the temporary but also propagate the local-ness through. This allows us to record deps at the top level, necessary for effect deps. Previously the pass was only ever concerned with tracking deps within function expressions.
• Refactor the bulk of the dependency-checking logic from onFinishMemoize() into a standalone helper to use it for the new onEffect() helper as well.

A few important remaining todos:

• Add a new ErrorCategory for effect deps, use it for errors on effects
• Put the effect dep validation behind a feature flag
• Adjust the error reason for effect errors

Testing it locally on fixtures this looks ballpark right but i didn't do an exhaustive test.

Feel free to commandeer and edit :-)

[josephsavona]

Spot checking the test failures they look mostly legit, lots of cases where our test fixtures have non-exhaustive deps.

[josephsavona]

The additional changes look great, nice and clean way to detect effect events.

I can't stamp my own PR but...shipit

[josephsavona]

Nice :-)