The logic for checking for repo self-updates lives in _FetchMain, which
is part of the "phased" sync path.
Extract this logic into a new _UpdateRepoProject helper method. Call
this common helper from _ExecuteHelper before either sync mode begins,
so the repo self-update check is always performed.
Bug: 421935613
Change-Id: I9a804f43fbf6239c4146be446040be531f12fc8a
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/484041
Reviewed-by: Scott Lee <ddoman@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>
f7a3f99dc9