Merge branch 'kn/fix-fetch-backfill-tag-with-batched-ref-updates'

Merge branch 'kn/fix-fetch-backfill-tag-with-batched-ref-updates'

"git fetch" that involves fetching tags, when a tag being fetched
needs to overwrite existing one, failed to fetch other tags, which
has been corrected.

* kn/fix-fetch-backfill-tag-with-batched-ref-updates:
  fetch: fix failed batched updates skipping operations
  fetch: fix non-conflicting tags not being committed
  fetch: extract out reference committing logic