Adding noAuth extension loading

[codyrancher]

Summary

Adding noAuth extension loading. This will allow specific extensions (such as extensions locale or login page modifications) to load even if the user isn't authenticated.

Fixes #9814

Areas or cases that should be tested

• When extensions are installed
• Extensions before a user logs in
• Extensions after a user logs in
• Extensions after a user logs out
• A cluster with 2 versions of harvester and navigating between the two separate instances

Areas which could experience regressions

• When extensions are installed
• Extensions before a user logs in
• Extensions after a user logs in
• Extensions after a user logs out
• A cluster with 2 versions of harvester and navigating between the two separate instances

Screenshot/Video

To test you can used the extensions in this repo https://github.com/rancher/ui-plugin-charts.
The uk-locale extension is one that can be loaded without authentication.

To verify you can check to see if the locale is present at the login screen:

You can also verify that the script tags are present in the head tag:

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

[codyrancher]

@richard-cox All of the comments/questions around changing code I'd create a separate issue and do in a separate PR. I wanted your take before doing it.

[richard-cox]

• When installing (or upgrading to) a version of the extension with noAuth: true we should show the user some kind of warning / notification about the repercussions.
• Somethings a bit broken with the https://github.com/rancher/ui-plugin-examples uk-loacle extension
  • there's a bad app version index.yaml
  • (probably related to above) installing 1.1.0 results in an install reporting as 1.0.0... but has the noAuth flag in... but the id loaded is uk-locale-0.1.0
• Edit: Installing the Kamaji extension results in a new cluster explorer Multitenancy Management menu option. Clicking this in 2.9-head shows some kind of landing zone, clicking this with this branch gives an Product Multitenancy Management not found error. Not quite sure how it's so, but required investigating I hit the same issue in another branch. I think this is a general bug in their extension

[codyrancher]

* Somethings a bit broken with the https://github.com/rancher/ui-plugin-examples uk-loacle extension
  * there's a bad app version index.yaml
  * (probably related to above) installing 1.1.0 results in an install reporting as 1.0.0... but has the noAuth flag in... but the id loaded is uk-locale-0.1.0

I've created a PR to address this here: rancher/ui-plugin-examples#38

[codyrancher]

When installing (or upgrading to) a version of the extension with noAuth: true we should show the user some kind of warning / notification about the repercussions.

install-banner.mp4

update-banner.mp4

[richard-cox]

Just one comment / suggestion regarding the warning