Showing better Error messages

[gnunicorn]

We have several screens where when one item fails to load (for whatever reason), we show plenty of ugly inline error messages that are almost impossible to do anything with. This is the first part of #2097 , which implements:

• For entire pages, a good looking error messages overlaying the loading content, with (where possible)
  • retry-button
  • bug reporting-button with support to sent the error and the stack trace
• do something smart about the passed error (e.g. parsing 'not found' and show something less threatening)
• SpaceDetailsPage, with tests
• Pins
  • PinsList, with Tests
  • PinsDetails, with Tests

Dialog in Action with 404 on not found:

404-for-space.mp4

Sending Error and Stack via Bug Reporter:

bug-reporting-with-stack.mp4

This created the following report:

New bug reporter test

Number of logs: 0
Application: a3-dev
Labels: 
User-Agent: a3-dev/a3-dev
Version: DEV
description: with description field for more text now!
error: Space !asdgf not found
stack: 

To the reviewers:
This introduces a new ActerErrorDialog and ErrorPage to the toolkit allowing any page to show neat looking errors (rather than ugly inlined Text('error msg') ones) with the ability to report it as a bug or retry (by invalidating the provider, usually). For that the PR refactors the bug reporter into its own feature and refactors some of the pages to allow us to have automatic test confirm the error pages are shown and the retry is successfully done. The idea to expand all this over the entire system, including functional tests.

[github-actions]

Hey there 👋,
and thanks for the contribution. But it seems like you forgot to

• 📰 Add a markdown file in .changes/ explaining what changed

[kumarpalsinh25]

Very good initiative! Pretty help for end user experience and better bug management.

[kumarpalsinh25]

Assuming that this is only changes related to action function in separate file.