Kubewarden/admission controller branding in SUSE Rancher

[flavio]

Currently the UI extension lacks SUSE Rancher branding under the "Rancher Extensions" page:

We should:

• Avoid the usage of the Kubewarden Icon
• Do not mention Kubewarden - the admission controller

This is consistent with the changes done inside of the Rancher sidebar: we now create a "Admission Policy Management" and there are no mentions of Kubewarden into the pages.

[olblak]

Once we have the logo, we should also sync with the AppCo team to update the logo on https://apps.rancher.io/applications/suse-security-admission-controller