docs(argocd-apps): Add deprecated note for Argo CD Extensions (#2449)

* docs(argocd-apps): Add deprecated note for Argo CD Extensions

Signed-off-by: yu-croco <yu.croco@gmail.com>

* fix(argocd-apps): Remove broken CI

Signed-off-by: yu-croco <yu.croco@gmail.com>

* chore(argocd-apps): Bump minor version due to deprecation

Signed-off-by: yu-croco <yu.croco@gmail.com>

---------

Signed-off-by: yu-croco <yu.croco@gmail.com>

charts/argocd-apps/ci/extensions-values.yaml

@@ -1,12 +0,0 @@
-# Test with extensions
-
-extensions:
-  - name: example
-    namespace: default
-    additionalLabels: {}
-    additionalAnnotations: {}
-    sources:
-      - git:
-          url: https://github.com/argoproj-labs/argocd-example-extension.git
-      - web:
-          url: https://github.com/argoproj-labs/argocd-example-extension/releases/download/v0.1.0/extension.tar