feat: Add investigations app backend (#98084)

* add initial structure for investigations app backedn

* update version

* Fix codegen & paths

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Fix Go workspace and CODEOWNERS

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* update kinds for investigation

* update dockerfile

* update codeowners

* update dependabot

* update golangci

* add investigation app and watcher

* run make update-workspace

* run make update-workspace

* register investigation app

* add investigation app to wireset

* add investigations app provider to api initializer

* fix imports

* update feature toggle

* fix cue definition and api initializer

* clean up removing unecessary components

* remove watcher feature toggle

* add investigations backend behind feature toggle

* revert change

---------

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>
Co-authored-by: Igor Suleymanov <igor.suleymanov@grafana.com>

.github/dependabot.yml

@@ -8,6 +8,7 @@ updates:
     directories:
       - "/"
       - "/apps/playlist"
+      - "/apps/investigation"
       - "/pkg/aggregator"
       - "/pkg/apimachinery"
       - "/pkg/apiserver"