OWNERS: remove sig-testing-approvers

It's not used enough to add any real value. Instead, it obscures the real
ownership when someone looks at an OWNERS file where it is used.

OWNERS_ALIASES

@@ -216,13 +216,6 @@ aliases:
     - cblecker
     - spiffxp
     - dims
-  sig-testing-approvers:
-    - bentheelder
-    - cblecker
-    - spiffxp
-    # emeritus
-    # - ixdy
-    # - krzyzacy
   sig-node-approvers:
     - Random-Liu
     - dchen1107

hack/jenkins/OWNERS

@@ -1,6 +1,8 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  - sig-testing-approvers
+  - bentheelder
+  - cblecker
+  - spiffxp
 reviewers:
   - sig-testing-reviewers

test/OWNERS

@@ -36,9 +36,9 @@ approvers:
   - pwittrock # for test/e2e/kubectl.go
   - saad-ali
   - SataQiu
-  - sig-testing-approvers
   - smarterclayton
   - soltysh
+  - spiffxp
   - sttts
   - thockin
   - wojtek-t
@@ -46,7 +46,9 @@ emeritus_approvers:
   - eparis
   - foxish
   - gmarek
+  - ixdy
   - krousey
+  - krzyzacy
   - kow3ns
   - madhusudancs
   - marun

test/e2e/framework/OWNERS

@@ -1,7 +1,6 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  - sig-testing-approvers
   - andrewsykim
   - fabriziopandini
   - pohly