Helm repository doesn't get deleted from argocd-cm when deleted from UI.

[dheeth]

Checklist:

• I've searched in the docs and FAQ for my answer
• I've included steps to reproduce the bug.

Describe the bug

If any of the helm-repository stops responding from server side or if we block access to it from our cluster, Argocd blocks all helm chart deployments until access to that repository is resolved

To Reproduce

1. Create a temporary helm repo and add it on Devtron and then remove the repo so that the repo doesn't exist anymore or block access to any existing helm repository url from cluster
2. Argocd will respond with errors if you deploy or update and deploy any helm chart from any repo
3. Delete the repo from Devtron UI

Expected behavior

The error from argocd should get resolved as we have already deleted the repository using Devtron

Current behavior

It doesn't get resolved as argocd fetches repositories from argocd-cm and the repo after deleting from devtron still exists in argocd-cm and we have to delete it manually

AB#342