`FindProjects` gets its candidate projects from `GetProjects` and then
applies regex matching. However, it only forwards `all_manifests`, so
other project filters are lost on regex paths.
As a result, `repo forall -r/-i --groups` falls back to the configured
group selection instead of using the requested groups.
Similarly, `repo list -r --groups` ignores the requested groups, and
`repo list -r --all` still excludes projects without a checkout.
Pass `groups` and `missing_ok` through `FindProjects`, and forward the
existing options from `forall` and `list`. When no group override is
given, keep using each manifest's effective groups.
Add regression tests for `FindProjects` and both command paths.
Change-Id: I5dfc22172fdd81de5312a84433867300a1342aec
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/631281
Reviewed-by: Mike Frysinger <vapier@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Victor Pushkarev <corvinus.v@gmail.com>
Tested-by: Victor Pushkarev <corvinus.v@gmail.com>
