fix: allow Node.js to manage microtasks queue #28974
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When `uv_run()` resulted in invocation of JS functions the microtask queue checkpoint in Node's CallbackScope was a no-op because the expected microtask queue policy was `kExplicit` and Electron ran under `kScoped` policy. This change switches policy to `kExplicit` right before `uv_run()` and reverts it back to original value after `uv_run()` completes to provide better compatibility with Node.
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11-x-y
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May 3, 2021
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Backport of #28957
See that PR for details.
Notes: Allow Node.js to manage microtasks queue by using explicit microtasks policy before calling
uv_run()