Use the new `ExecutorFactory` protocol to provide a default executor#353

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kateinoigakukun wants to merge 3 commits intomainfrom

yt/new-global-task-executor

Commits on May 1, 2025

Split out the letacy hook-based global task executor
kateinoigakukun
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Use the new `ExecutorFactory` protocol to provide a default executor
kateinoigakukun
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CI: Update nightly toolchain in CI workflow
kateinoigakukun
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