Merge 0.8-dev to master

[soininen]

Re spine-tools/Spine-Toolbox#2692

Checklist before merging

• [x] Unit tests pass

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 83.55030% with 417 lines in your changes are missing coverage. Please review.

Project coverage is 78.25%. Comparing base (828ff38) to head (cd995e0).

Files	Patch %	Lines
spinedb_api/db_mapping.py	69.02%	117 Missing and 19 partials :warning:
spinedb_api/mapped_items.py	89.00%	29 Missing and 14 partials :warning:
spinedb_api/parameter_value.py	77.89%	34 Missing and 8 partials :warning:
spinedb_api/query.py	77.57%	19 Missing and 5 partials :warning:
...ccf80441_replace_values_with_reference_to_list_.py	36.11%	22 Missing and 1 partial :warning:
spinedb_api/db_mapping_query_mixin.py	95.41%	16 Missing and 3 partials :warning:
spinedb_api/db_mapping_commit_mixin.py	86.27%	11 Missing and 3 partials :warning:
spinedb_api/export_mapping/export_mapping.py	87.27%	9 Missing and 5 partials :warning:
spinedb_api/import_mapping/import_mapping.py	90.34%	12 Missing and 2 partials :warning:
spinedb_api/spine_db_server.py	56.25%	14 Missing :warning:
... and 16 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #393 +/- ## ========================================== + Coverage 75.33% 78.25% +2.92% ========================================== Files 76 75 -1 Lines 10985 9511 -1474 Branches 2391 2014 -377 ========================================== - Hits 8275 7443 -832 + Misses 2272 1735 -537 + Partials 438 333 -105 ```

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[soininen]

Toolbox unit tests will run in PR spine-tools/Spine-Toolbox#2731, we do not need modify the GitHub action temporarily for that in this branch.