Add minor improvements prior to the repos UI

[antgamdia]

Description of the change

As part of the work required for #4764, this prequel PR adds minor stuff that I can easily have taken apart from my ongoing changes. Namely:

• Related to the Repos UI:
  • Add more information to the core API logs
  • Add more str cases in getPluginPackageName
  • Add repos api clients to KubeappsGrpcClient
• Minor unrelated improvements
  • Handle uncaught canI rejections
  • Remove "as unknown" in some types
  • Return 0 if equals in a sort function

Benefits

Subsequent PRs will have less code to review :P

Possible drawbacks

N/A

Applicable issues

• related Use the new Repositories API in the UI #4764

Additional information

The changes are pretty unrelated to the actual repos API things, as they are mainly improvements on other parts of the code.

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[castelblanque]

Great, thanks for the preparation work!