Update CODEOWNERS (#193)

We are changing the PR model so that only a small group of maintainers
can give final approval on PRs,
https://github.com/orgs/aws-observability/teams/aws-application-signals-maintainers

By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice.

Author: thpierce

.github/CODEOWNERS

@@ -2,7 +2,4 @@
 #  https://help.github.com/en/articles/about-code-owners
 
 # Default owners for the entire repo
-* @aws-observability/aws-application-signals-team
-
-# Owners for aws-otel-distro folder
-/aws-otel-distro/ @zzhlogin @thpierce @srprash @AsakerMohd
+* @aws-observability/aws-application-signals-maintainers