Raise RepoExitError in place of sys.exit

Bug: b/293344017
Change-Id: Icae4932b00e4068cba502a5ab4a0274fd7854d9d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/382214
Reviewed-by: Gavin Mak <gavinmak@google.com>
Tested-by: Jason Chang <jasonnc@google.com>
Reviewed-by: Aravind Vasudevan <aravindvasudev@google.com>
Commit-Queue: Jason Chang <jasonnc@google.com>

error.py

@@ -56,6 +56,10 @@ class RepoUnhandledExceptionError(RepoExitError):
         self.error = error
 
 
+class SilentRepoExitError(RepoExitError):
+    """RepoExitError that should no include CLI logging of issue/issues."""
+
+
 class ManifestParseError(RepoExitError):
     """Failed to parse the manifest file."""
 
@@ -125,6 +129,10 @@ class DownloadError(RepoExitError):
         return self.reason
 
 
+class InvalidArgumentsError(RepoExitError):
+    """Invalid command Arguments."""
+
+
 class SyncError(RepoExitError):
     """Cannot sync repo."""