sig-release: Add subproject leads as reviewers/approvers for subdirs

Grants:

- Reviewer:
  - /sig-release
- Approver:
  - /communication/slack-config/sig-release
  - /contributors/devel/sig-release

Signed-off-by: Stephen Augustus <foo@auggie.dev>

OWNERS_ALIASES

@@ -189,4 +189,8 @@ aliases:
   provider-vmware:
     - cantbewong
     - frapposelli
+  sig-release-subproject-leads:
+    - gracenng
+    - katcosgrove
+    - xmudrii
 ## END CUSTOM CONTENT

communication/slack-config/sig-release/OWNERS

@@ -1,8 +1,9 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 reviewers:
-  - sig-release-leads
+  - sig-release-subproject-leads
 approvers:
   - sig-release-leads
+  - sig-release-subproject-leads
 labels:
   - sig/release

contributors/devel/sig-release/OWNERS

@@ -1,8 +1,9 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 reviewers:
-  - sig-release-leads
+  - sig-release-subproject-leads
 approvers:
   - sig-release-leads
+  - sig-release-subproject-leads
 labels:
   - sig/release

sig-release/OWNERS

@@ -1,7 +1,7 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 reviewers:
-  - sig-release-leads
+  - sig-release-subproject-leads
 approvers:
   - sig-release-leads
 labels: