Vulnerability Scanner installation hangs on final step without error feedback

[rak-phillip]

The UI does not surface any error or failure state when attempting to install and configure the Vulnerability Scanner using invalid credentials. Instead, the installation process appears to hang indefinitely on the final step, leaving the user without guidance on what went wrong.

Steps to reproduce

While running the security-ui-exts development build for a freshly installed instance of Rancher 2.15-head:

• Navigate to Local Cluster Explorer => Vulnerability Scanner and click "Start installation"
• Step 1: Select "Create an HTTP Basic Auth Secret; enter any value for the username; enter any value for the password (testuser/testuser was used for this reproduction); click "Continue"
• Step 2: Click "Add all repositories"
• Step 3: Observe the behavior

Actual behavior

Step 3 is rendered, indefinitely displaying a loading indicator.

Expected behavior

If there is an issue with installing the Vulnerability Scanner, an error message is relayed to the user to indicate what might be wrong.

Additional context

I intentionally entered invalid credentials for this reproduction, but there's a valid scenario where a user might make a typo when initially installing the extension, leaving them in a scenario that's difficult to understand and with unclear recovery steps.

Screenshots

[xingzhang-suse]

It is not 100% percent reproducible. But it happened on my testbed sometimes. I can observe there are many 409 errors which is from the repository refresh action. It is caused by the concurrent requests for cert-manager, cnpg, suse-security-vulnerability-scanner's repo
I modified the code to send the request one after another finished.
In the latest rancher/shell (v3.012-rc.3), the rancher shell enabled error popup for every API call which is triggered by the repo refresh action. So if there is any error happens during the request processing, the error message will display.

The change will come with the fix for #602