Warn users if the effective job count specified via `-j`,
`--jobs-network`, or `--jobs-checkout` exceeds a threshold
(currently 100). This encourages users to use more reasonable
values.
Bug: 406868778
Bug: 254914814
Change-Id: I116e2bbaf3dc824c04d1b2fbe52cf9ca5be77b9a
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/466801
Reviewed-by: Mike Frysinger <vapier@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>