Map the csp, federal, and rgs themes to suse

[rak-phillip]

Summary

This maps the csp, federal, and rgs themes to suse by introducing a new brand getter.

Fixes #15794

Occurred changes and/or fixed issues

• Map csp and federal brands to suse
• Preserve brand logos
• Add consts for brands

Technical notes summary

The mapping of the brand is performed through a new brand getter that will translate "csp", "federal", and "rgs" brands to "suse".

This also aims to preserve the included logos for the affected themes, if one exists, by adding a special case to fetch the original logo for rancher-logo.svg in shell/components/BrandImage.vue

Areas or cases that should be tested

Updating the theme and assert the following produce the expected result

• Banners
• Logos
• Color scheme
• Login image
• Favicon

Areas which could experience regressions

Unknown edge cases might be used throughout Dashboard where custom behavior or styles are applied based on the brand.

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
• The PR has been reviewed in terms of Accessibility
• The PR has considered, and if applicable tested with, the three Global Roles Admin, Standard User and User Base

[richard-cox]

Did we confirm with RGS that they're fine moving from community to suse branding?

I went through the built in brand files and for each there's different overrides

// csp: rancher-logo.svg, favicon, hasStylesheet: true
// federal: rancher-logo.svg
// rgs: rancher-logo.svg

With this approach the favcicon and hasStylesheet parts are lost for csp. I think favicon is fine (they're both very similar) but not sure on hasStylesheet. looking at what it does... it just adds the brand name csp as a style to the body. we could risk it and see what breaks, will leave that one with you.

[rak-phillip]

With this approach the favcicon and hasStylesheet parts are lost for csp. I think favicon is fine (they're both very similar) but not sure on hasStylesheet. looking at what it does... it just adds the brand name csp as a style to the body. we could risk it and see what breaks, will leave that one with you.

I think that this is fine. The csp stylesheet is just overriding some color variables and supplying a few of its own, which we don't want if it is to match the suse theme. FYI @nwmac to confirm.

[rak-phillip]

/backport v2.13.1 release-2.13