fix: improve error notifications for better UX

[f1ames]

This PR fixes #28.

It based on #25 branch so needs to be merged after that one.

There are few related, follow-up issues to help with better on-boarding and fixing invalid configuration - #27, #30 and kubeshop/monokle-core#483.

Changes

• Improved error handling after Introduce login via device flow #25 refactor.

Fixes

• Now, notifications will not be shown on every policy pull which errors (due to any reason). Instead, status bar icon changes it's state and shows error details and possible fix suggestion (for specific cases which we know how to fix).

Remarks

• Kind of quick fix, so the tooltip status management is a bit too fragmented in different places. At first it was very simple util, now it's more like global status holder/provider. May need a bit of refactoring in the future.

Checklist

• tested locally
• added new dependencies
• updated the docs
• added a test

[f1ames]

Rebased onto latest main.