core(fr): parity on Stacks and FullPageSnapshot gatherers #12907
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Summary
Achieves parity with legacy runner on Stacks gatherer and FullPageSnapshot gatherer (the two necessary to match results on the dobetterweb smoketest). This also adds the ability to target assertions to the legacy or FR runner in smoketests to account for irreconcilable differences like fewer passes and extra contexts that change the ID of certain artifacts.
Related Issues/PRs
ref #12861 #11313