Description of problem:

When installation is disabled, the actions on the Installed Packages page are still shown. Similarly, if the YAML file is misconfigured, the actions appear, but the API call fails with an error. This doesn't break the UI, the API failure is handled gracefully, and the correct reason for the failure is displayed in the UI.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

update your extensions config to:

```
extensions:
  installation:
     enabled: false
     saveToSingleFile:
        file: ....
```
Go to Extensions -> Installed packages -> Edit a package

Actual results:

The UI shows an error saying that the installation is disabled.

Expected results:

Users should be informed beforehand when the installation is disabled.

Reproducibility (Always/Intermittent/Only Once):

Build Details:

Additional info (Such as Logs, Screenshots, etc):