Merge pull request #1399 from k8s-infra-cherrypick-robot/cherry-pick-1396-to-release-1.12

[release-1.12] Add tyuchn to owner and reviewer list

Author: tyuchn

OWNERS

@@ -6,6 +6,7 @@ reviewers:
   - saikat-royc
   - sunnylovestiramisu
   - pwschuurman
+  - tyuchn
 approvers:
   - amacaskill
   - leiyiz
@@ -14,6 +15,7 @@ approvers:
   - saikat-royc
   - sunnylovestiramisu
   - pwschuurman
+  - tyuchn
 emeritus_reviewers:
   - davidz627
   - jingxu97