Add pyrx-admins as code owners (#1976)

* Add pyrx-admins as code owners

* Combine CODEOWNERS entries into a single line

Author: bschnurr

.github/CODEOWNERS

@@ -4,4 +4,4 @@
 # in the repository, i.e. bar/baz will match /bar/baz and /foo/bar/baz.
 
 # The default owners for everything that is not overridden by specific patterns below.
-*   @microsoft/debugpy-CodeReviewers
+*   @microsoft/debugpy-CodeReviewers @microsoft/pyrx-admins