Make CODEOWNERS additive

Since CODEOWNERS isn't additive, we need to mention all owners of any
pattern defined in the function. For the operator, this results in
duplicating the '*' owners on all lines.

This will avoid code-owner-based review and merging being limited by
having a single person identified as the code owner for a review.

Signed-off-by: Stephen Kitt <skitt@redhat.com>

CODEOWNERS

@@ -1,6 +1,6 @@
-* @mangelajo @tpantelis @Oats87 @skitt
-/.github/workflows/ 	@mkolesnik
-/scripts/ 		@mkolesnik
-Makefile* 		@mkolesnik
-Dockerfile.dapper 	@mkolesnik
-build/* 		@mkolesnik
+*			@mangelajo @tpantelis @Oats87 @skitt
+/.github/workflows/ 	@mangelajo @tpantelis @Oats87 @skitt @mkolesnik
+/scripts/ 		@mangelajo @tpantelis @Oats87 @skitt @mkolesnik
+Makefile* 		@mangelajo @tpantelis @Oats87 @skitt @mkolesnik
+Dockerfile.dapper 	@mangelajo @tpantelis @Oats87 @skitt @mkolesnik
+build/* 		@mangelajo @tpantelis @Oats87 @skitt @mkolesnik