Various string cleanups (#30435)

* Remove some unnecessary string concatenations

* Replace some simple str.formats with f-strings

* Replace some string concatenations with f-strings

tests/test_setup.py

@@ -327,7 +327,7 @@ class TestSetup:
             """Test that config is passed in."""
             if config.get("comp_a", {}).get("valid", False):
                 return True
-            raise Exception("Config not passed in: {}".format(config))
+            raise Exception(f"Config not passed in: {config}")
 
         platform = MockPlatform()