Replace default codeowners with @SumoLogic/tf-platform-team

Author: ErikAtSumo

.github/CODEOWNERS

@@ -4,7 +4,7 @@
 # These owners will be the default owners for everything in
 # the repo. Unless a later match takes precedence, they will
 # be requested for review when someone opens a pull request.
-*       @sumovishal @ashpaliwal @adisuj @ErikAtSumo @sjain05
+*       @SumoLogic/tf-platform-team
 
 # Code owners for collection sources
 /sumologic/*_source.go        @maimaisie @vsinghal13