Improve hardLimitReader error logging
We've encountered this problem here: https://gitlab.com/gitlab-org/gitlab/-/issues/249561#note_440751368 We also might want to improve the upload size limiting code in workhorse so that it logs an error when we hit the limit that includes what the actual limit is. If we had access to `ctx` [here](https://gitlab.com/gitlab-org/gitlab-workhorse/-/blob/1078eaf11b3980f16ac3edf6df4ace9118e87ebe/internal/filestore/reader.go#L14) we could write a message that includes the limit value and that gets the correlation ID.
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