[DO NOT MERGE] feat(codemod): change migrate behavior for majors #8187
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Do not merge yet - we need to make sure that codemods that are not idempotent are handled correctly. I think the only one that isn't is the default outputs code mod, so we need to identify if we need to run it.
Testing Instructions
Remove legacy filter flags now that they've been deprecated for quite
awhile.
Existing test suite passes. Updated tests that are still applicable and
removed those that aren't.