Action loop and callback mapping tests

[petar-qb]

Description

• Fixed export_data targets issue - Any False object is treated as all targets set.
• Unit tests for fixed export_data fixed bug.
• Unit tests for the Action loop util functions.
• Unit tests for the callback mapping util functions.
• The code coverage is increased (from 87% -> 93%).

Screenshot

Checklist

• I have not referenced individuals, products or companies in any commits, directly or indirectly
• I have not added data or restricted code in any commits, directly or indirectly
• I have updated the docstring of any public function/class/model changed
• I have added the PR number to the change description in the changelog fragment, e.g. Enable feature XXX ([#1](https://github.com/mckinsey/vizro/pull/1)) (if applicable)
• I have added tests to cover my changes (if applicable)

Types of changes

• Docs/refactoring (non-breaking change which improves codebase)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Notice

• I acknowledge and agree that, by checking this box and clicking "Submit Pull Request":

  • I submit this contribution under the Apache 2.0 license and represent that I am entitled to do so on behalf of myself, my employer, or relevant third parties, as applicable.
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  • I certify that the use of this contribution as authorised by the Apache 2.0 license does not violate the intellectual property rights of anyone else.

[maxschulz-COL]

Great stuff, we are getting there! Have some comments for discussion

[antonymilne]

As far as I can tell this looks good, but I'm not really familiar enough with the actions and actions tests to offer a very thorough review unfortunately. Increasing test coverage is always good anyway!

I left some questions that would help me understand a bit better though, and probably after that I'll be happy to approve 🙂

[antonymilne]

Thanks for all the updates to this, looks really good now 💯

[maxschulz-COL]

Lgtm, have a few more suggestions, but feel free to ignore the ones you don't like