Resolve "Update CODEOWNERS on BigBang"

Package Owner Merge Request

Package Changes

Changes made to CODEOWNERS documentation for: istio-operator, authservice, istio-controlplane

Associated MRs:

• https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-operator/-/merge_requests/14
• https://repo1.dso.mil/platform-one/big-bang/apps/core/authservice/-/merge_requests/31
• https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/58

Additional Details

Removed @kenna81 from the CODEOWNERS list to match the MRs listed above.

Once the MR is ready for review also add the status::review label.

Closes #562 (closed)