Merge branch 'ps/fetch-cleanups'

Code clean-up. * ps/fetch-cleanups: fetch: use `fetch_config` to store "submodule.fetchJobs" value fetch: use `fetch_config` to store "fetch.parallel" value fetch: use `fetch_config` to store "fetch.recurseSubmodules" value fetch: use `fetch_config` to store "fetch.showForcedUpdates" value fetch: use `fetch_config` to store "fetch.pruneTags" value fetch: use `fetch_config` to store "fetch.prune" value fetch: pass through `fetch_config` directly fetch: drop unneeded NULL-check for `remote_ref` fetch: drop unused DISPLAY_FORMAT_UNKNOWN enum value