fix(cache): pass graced entry to factory in SWR path

[niksy]

In SWR mode, getOrSet could invoke the factory withgracedEntry set to undefined even when a stale value existed. This happened because the SWR background factory run did not receive gracedValue. gracedValue is now forwarded in that path so gracedEntry.value is consistently available.

I went ahead and adjusted tests so previous codebase fails, but new one passes. Previous assertion actually throws with AssertionError: expected undefined to deeply equal 'bar' but it’s not thrown since grace period for that test is set to 2 minutes and the graced value is returned, but that graced value is not available in factory context, only as return value of getOrSet call.

[changeset-bot]

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Latest commit: 2cb2edb

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