keps/sig-testing: declare 2290 stable

specifically

- retroactively refresh; this KEP was completed well before we migrated
  over to the new format, so it's best guess only for things I filled in
- drop the `@` from users so things don't need to be quote-wrapped

Author: spiffxp

keps/sig-testing/2290-new-label-for-trusted-PR-identification/README.md

@@ -88,7 +88,15 @@ N/A
 
 ## Graduation Criteria
 
-N/A
+Alpha:
+* `/ok-to-test` workflow live
+
+Beta:
+* `/ok-to-test` workflow fully documented
+* Comment parsing for `/ok-to-test` removed in favor of `ok-to-test` label presence
+
+Stable:
+* `/ok-to-test` workflow used without incident for more than 6 months
 
 ## Future evolutions
 
@@ -100,9 +108,13 @@ This would require adding automatically the `ok-to-test` label to member authore
 
 ## References
 
-* https://github.com/kubernetes/test-infra/issues/3827
-* https://github.com/kubernetes/test-infra/issues/7801
-* https://github.com/kubernetes/test-infra/pull/5246
+* Issues
+  * https://github.com/kubernetes/test-infra/issues/3827
+  * https://github.com/kubernetes/test-infra/issues/7801
+  * https://github.com/kubernetes/test-infra/issues/9754
+* PRs
+  * https://github.com/kubernetes/test-infra/pull/5246
+  * https://github.com/kubernetes/test-infra/pull/10991
 
 ## Implementation History
 
@@ -114,3 +126,4 @@ This would require adding automatically the `ok-to-test` label to member authore
 * 2018-10-08: start of implementation
 * 2018-10-10: `ok-to-test` label added
 * 2019-01-29: remove comment parsing code for PR trust
+* 2021-08-16: Retroactive stable declaration

keps/sig-testing/2290-new-label-for-trusted-PR-identification/kep.yaml

@@ -1,19 +1,25 @@
 title: New label for trusted PR identification
 kep-number: 2290
 authors:
-  - "@matthyx"
+  - matthyx
 owning-sig: sig-testing
 participating-sigs:
   - sig-contributor-experience
 reviewers:
-  - "@fejta"
-  - "@cjwagner"
-  - "@BenTheElder"
-  - "@cblecker"
-  - "@stevekuznetsov"
+  - fejta
+  - cjwagner
+  - BenTheElder
+  - cblecker
+  - stevekuznetsov
 approvers:
-  - TBD
-editor: TBD
+  - spiffxp
+editor: spiffxp
 creation-date: 2018-06-25
-last-updated: 2019-01-30
+last-updated: 2021-08-16
 status: implemented
+stage: stable
+latest-milestone: v1.13
+milestone:
+  alpha: v1.13
+  beta: v1.13
+  stable: v1.14