Update OCI repo creation message

[momesgin]

Summary

Fixes #13062

Occurred changes and/or fixed issues

• "Add OCI URLs that contain ONLY helm charts." changed to "OCI URLs should ONLY contain helm charts.", and displayed as a warning banner
• The last part of the message is removed "The list of charts available from the repository is updated every 6 hours."
• The rest of the message is displayed as an info banner

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[richard-cox]

Highlighting OCI URLs should ONLY contain helm charts. underlines that it's confusing. Should the url itself contain a reference to a specific helm chart collection, or should the url location only contain helm charts? Should this be

OCI repositories should ONLY contain helm charts.

@rohitsakala can you advise?

[rohitsakala]

@richard-cox Right now, if the OCI registry instead of an OCI repository is provided like oci://{host}:5000 and this registry only contains helm charts then it is supported . If the user provides OCI repository URL like oci://{host}:5000/helmcharts or oci://{host}:5000/rancher/helmcharts and only contain helmcharts, then it is supported. Let me know if this clarifies your question.

[richard-cox]

Thanks @rohitsakala , that makes sense.

@momesgin Maybe we should go with something like ...

OCI URLs must ONLY target helm chart/s

[momesgin]

Thanks @rohitsakala , that makes sense.

@momesgin Maybe we should go with something like ...

OCI URLs must ONLY target helm chart/s

Sounds good