Skip TestBuildGitFetchStrategyFallback on Windows cmd
What does this MR do?
This test doesn't work on cmd because the worktree is never cleaned
up. It appears that the exit code of the fetch sources script isn't
returned properly to os.Exec.Wait()
unless "& exit" is appended to
"cmd /c script.cmd". Since cmd is deprecated, skip this test.
Relates to #37393 (closed)
Edited by Stan Hu