Updates Growth issue templates

- reminder in cleanup template to update tracking issue
- reminder for PM in tracking issue to update knowledge base

.gitlab/issue_templates/Experiment Successful Cleanup.md

@@ -15,5 +15,6 @@ The changes need to become an official part of the product.
 - [ ] Optional: Migrate experiment to a default enabled [feature flag](https://docs.gitlab.com/ee/development/feature_flags) for one milestone and add a changelog. Converting to a feature flag can be skipped at the ICs discretion if risk is deemed low with consideration to both SaaS and (if applicable) self managed
 - [ ] In the next milestone, [remove the feature flag](https://docs.gitlab.com/ee/development/feature_flags/controls.html#cleaning-up) if applicable
 - [ ] After the flag removal is deployed, [clean up the feature/experiment feature flags](https://docs.gitlab.com/ee/development/feature_flags/controls.html#cleaning-up) by running chatops command in `#production` channel
+- [ ] Ensure the corresponding [Experiment Tracking](https://gitlab.com/groups/gitlab-org/-/boards/1352542?label_name[]=devops%3A%3Agrowth&label_name[]=growth%20experiment&label_name[]=experiment%20tracking) issue is updated
 
 /label ~"feature" ~"feature::maintenance" ~"workflow::scheduling" ~"growth experiment" ~"feature flag"  

.gitlab/issue_templates/experiment_tracking_template.md

@@ -81,6 +81,7 @@ If applicable, any groups/projects that are happy to have this feature turned on
 - [ ] Announce on the issue that the flag has been enabled
 - [ ] Remove experiment code and feature flag and add changelog entry - a separate [cleanup issue](https://gitlab.com/gitlab-org/gitlab/-/issues/new?issuable_template=Experiment%20Successful%20Cleanup) might be required
 - [ ] After the flag removal is deployed, [clean up the feature flag](https://docs.gitlab.com/ee/development/feature_flags/controls.html#cleaning-up) by running chatops command in `#production` channel
+- [ ] Assign to the product manager to update the [knowledge base](https://about.gitlab.com/direction/growth/#growth-insights-knowledge-base) (if applicable)
 
 ## Rollback Steps