docs(react): rename cacheTime to gcTime and clarify semantics

[wuzehao16]

Problem

Rename cacheTime to gcTime in TanStack Query v5.
Reference: https://tanstack.com/query/latest/docs/framework/react/guides/migrating-to-v5#rename-cachetime-to-gctime

Summary of Changes

Renamed references of cacheTime to gcTime across React docs to better convey semantics.

[changeset-bot]

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Latest commit: d032ad2

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