Allocate configuration scope lists only when needed (#31364) `BuildConfigurationKeyProducer.findBuildOptionsScopes()` allocates `flagsWithIncompleteScopeInfo` only when the first Starlark flag needs a scope lookup. Fully resolved flags avoid an empty `ArrayList`; the scope predicate, label order, lookup, and continuation are preserved. In a large build, mean Java allocation fell by 3.70 GB (0.48%) across four runs per version. Closes #31364 COPYBARA_INTEGRATE_REVIEW=https://github.com/bazelbuild/bazel/pull/31364 from dzbarsky:codex/pr78-lazy-scope-list-upstream a55e84145b62a85bd4e97e0d2d00b17a3679967b PiperOrigin-RevId: 991354262 Change-Id: I44489cf788764b5e594390868253d99419c85f13
{Fast, Correct} - Choose two
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