Chore: Remove Drilldown Investigations (#115471)

* Remove investigations app

* Remove other files

* Remove feature toggle

* Update codeowners

* make update-workspace

* Regen files with make gen-go gen-feature-toggles

.github/CODEOWNERS

@@ -94,7 +94,6 @@
 /apps/shorturl/ @grafana/sharing-squad
 /apps/secret/ @grafana/grafana-operator-experience-squad
 /apps/scope/ @grafana/grafana-operator-experience-squad
-/apps/investigations/ @fcjack @matryer @svennergr
 /apps/advisor/ @grafana/plugins-platform-backend
 /apps/iam/ @grafana/access-squad
 /apps/sdk.mk @grafana/grafana-app-platform-squad

.github/dependabot.yml

@@ -19,7 +19,6 @@ updates:
       - "/apps/dashboard"
       - "/apps/folder"
       - "/apps/iam"
-      - "/apps/investigations"
       - "/apps/playlist"
       - "/apps/plugins"
       - "/apps/preferences"