Update make format-frontend rule (#1225)

**Context:** The formatting command for C++ code under this rule is
currently only applied to files in the `frontend/catalyst/utils/`
directory. However, there are several other C++ files under `frontend/`
that could use this formatting rule, such as those under
`frontend/catalyst/third_party/oqc/src/`. Indeed, our CI action "Check
Code Formatting" [checks all C++ files under the project root
directory](https://github.com/PennyLaneAI/catalyst/blob/main/.github/workflows/check-formatting.yaml#L46),
which could result in a failure of this CI action if files modified in a
PR contain incorrect code formatting, even if `make format` had been run
locally before committing.

**Description of the Change:** This change updates the `make
format-frontend` rule to check/apply C++ code formatting to all files
under the `frontend/` directory.

**Benefits:** Formatting of all C++ files under `frontend/` modified in
a PR can be checked and fixed locally, avoiding a failure of the "Check
Code Formatting" CI action.

Makefile

@@ -262,11 +262,11 @@ endif
 .PHONY: format-frontend
 format-frontend:
 ifdef check
-	$(PYTHON) ./bin/format.py --check $(if $(version:-=),--cfversion $(version)) ./frontend/catalyst/utils
+	$(PYTHON) ./bin/format.py --check $(if $(version:-=),--cfversion $(version)) ./frontend
 	black --check --verbose .
 	isort --check --diff .
 else
-	$(PYTHON) ./bin/format.py $(if $(version:-=),--cfversion $(version)) ./frontend/catalyst/utils
+	$(PYTHON) ./bin/format.py $(if $(version:-=),--cfversion $(version)) ./frontend
 	black .
 	isort .
 endif