chore: enable redundant-test-main-exit rule for revive linter (#1868)

We've already addressed the violations of this in #1772, but could not
enable the rule at the time as it was mistakenly omitted from the schema
used by the action to valid the linter config - now though
golangci/golangci-lint#5692 has been released
and we've upgraded, that is no longer an issue 🎉

Author: G-Rath

.golangci.yaml

@@ -92,10 +92,8 @@ linters:
           disabled: false
         - name: redefines-builtin-id
           disabled: false
-        # todo: enable once we've upgraded to v2, as the validation schema
-        #    used by the github v1 action does not have this rule yet
-        # - name: redundant-test-main-exit
-        #   disabled: false
+        - name: redundant-test-main-exit
+          disabled: false
         - name: superfluous-else
           disabled: false
         - name: time-naming