Commit generated scheduler protos (#8200)

## What

- Commit generated scheduler protos.
- Improve `make ensure-no-changes` to detect untracked files.

## Why?

The protos were not generated since the tool was committed in a separate
PR from where the protos were added.

Author: bergundy

Makefile

@@ -650,4 +650,5 @@ go-generate: $(MOCKGEN) $(GOIMPORTS) $(STRINGER) $(GOWRAP)
 ensure-no-changes:
 	@printf $(COLOR) "Check for local changes..."
 	@printf $(COLOR) "========================================================================"
-	@git diff --name-status --exit-code || (printf $(COLOR) "========================================================================"; printf $(RED) "Above files are not regenerated properly. Regenerate them and try again."; exit 1)
+	@git status --porcelain
+	@test -z "`git status --porcelain`" || (printf $(COLOR) "========================================================================"; printf $(RED) "Above files are not regenerated properly. Regenerate them and try again."; exit 1)