JS: Deprecations and related refactorings #18132
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Deprecates a lot of stuff and refactors a few things to avoid depending on deprecated predicates ourselves. Also adds more documentation for how to use flow summaries.
Evaluation shows a a nice little speed-up of 1.7% average and 3% median, resulting from the refactorings mentioned.
More deprecations and migration docs will likely follow in later PRs.