Fix `revalidateTag` with `fetch` and `"use cache"` (#72075)
We already propagate tags from `fetch` calls to the work unit store. For
`revalidateTag` to work properly for `fetch` calls in `"use cache"`, we
also need to consider the other direction, and add tags from the work
unit store to the tags that are used for the fetch cache entry in the
cache handler.
fixes #71924
