Missing helm chart warning when the helm chart index couldn't be fetch

Description of problem:
Follow up on OCPBUGS-803: In this ticket the backend adds a new annotation if one or more chart repositories couldn't be downloaded.

This (new) error message is not yet displayed in the developer catalog.

Version-Release number of selected component (if applicable):
4.11 / 4.12

How reproducible:
Always

Steps to Reproduce:

1. Login OCP as administrator, change to "Developer" prespective
2. Navigate to Helm page -> Helm Releases Tab, click the link "Install a Helm Chart from the developer catalog"
3. Click the link "try to configure their own custom Helm Chart repository"
4. Fill in the Form with value, and click create
   Name: test
   URL: http://test.test.com
5. Check if Helm Charts page can be loaded successfully without any error message
6. Navigate to Helm -> Helm Releases Tab -> Click the link and go to Helm Charts page again
7. Check if the Hel Charts page can be loaded successfully without any error

Actual results:

1. Other helm charts should be displayed with the latest backend change
2. But the user didn't notice that some helm charts are missing.

Expected results:

1. Other helm charts should be displayed.
2. The user should see a warning that some helm charts are not displayed.

Additional info:
kmamgain@redhat.com initial PR was https://github.com/openshift/console/pull/12096 but we discussed that we update the annotation to something like this:

annotations:
  console-warning: One or more Helm Chart repositories could not be fetched. (Missing charts from: A, B, C. Reason: ${err.Error()})

The complete string is build in the backend. The console should show this warning always in developer catalog when it's defined (and not empty).