AST: Refactor pattern binding initializer expression state representation #69918
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As a follow up to #69841, clarify the possible states that initializer expression of a pattern can be in. The possible states are not checked, checked, and "checked and contextualized" (which is the new state that was introduced and requestified in the previous PR). This refactoring encodes the states more explicitly and renames a few compiler APIs to better align with the new naming. NFC.