HARVESTER: improve exhibition of addon's status

[DaiYuzeng]

Summary

PR Checklist

• Is this a multi-tenancy feature/bug?
  • Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • Yes, the backend owner is:

Occurred changes and/or fixed issues

We want to improve the exhibitions of addon's status.

• [BUG] Rancher Monitoring AddOn Fails Silently - Doesn't Bubble Up Information to Addon Index harvester#4067

Technical notes summary

Areas or cases that should be tested

1. Swtich enabling/disabling status of addon quickly should be failed and you should see the error message on the top-right corner.
2. When enabling/disabling/updating if you edit the configurations of addon and then save, save should be failed and the error message should be also displayed.

Areas which could experience regressions

Screenshot/Video

[WuJun2016]

lgtm, thanks

[WuJun2016]

@mergify backport release-harvester-v1.2

[mergify]

backport release-harvester-v1.2

✅ Backports have been created

• #839 HARVESTER: improve exhibition of addon's status (backport #833) has been created for branch release-harvester-v1.2