feat(service-worker): finish implementation of refreshAhead feature #53356
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Copy and document the refreshAhead option that allows to refresh cache entries before they expire. This allows to mark cached entries as stale while still retruning them until maxAge in case of service outage.
Closes #46729
PR Checklist
Please check if your PR fulfills the following requirements:
PR Type
What kind of change does this PR introduce?
What is the current behavior?
Issue Number: #46729
What is the new behavior?
refreshAhead config is honored
Does this PR introduce a breaking change?
Other information