Refactor test runner injection patterns

[sandreae]

Fun weekend refactoring project ;-p

Haven't changed any functionality here, just some nice tidy-up I've been wanting to do forever. Main objectives:

• use similar pattern for injecting one test db into a test or working with the test db manager for creating many
• separate the test runner logic from the store population logic for transparency and flexibility
• don't use rstest for injecting the test runner
• take the chance to add a few more doc strings to test utils and tests where needed

There are some naming changes and reorganising the modules a little too.

I don't think there is anything controversial here, mostly involved a lot of brainless method renaming 🤣 so I don't think a thorough review is required. Happy to chat about the naming choices if you have input there though @adzialocha.

closes: #276 #208 #183

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

Base: 94.22% // Head: 93.39% // Decreases project coverage by -0.83% ⚠️

Coverage data is based on head (34e3ceb) compared to base (4575251).
Patch coverage: 98.25% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #277      +/-   ##
==========================================
- Coverage   94.22%   93.39%   -0.83%     
==========================================
  Files          62       63       +1     
  Lines        5144     5180      +36     
==========================================
- Hits         4847     4838       -9     
- Misses        297      342      +45     

Impacted Files	Coverage Δ
aquadoggo/src/test_utils/db.rs	92.30% <ø> (-2.14%)	⬇️
...quadoggo/src/graphql/client/dynamic_types/tests.rs	23.80% <27.27%> (-76.20%)	⬇️
aquadoggo/src/test_utils/runner.rs	90.69% <93.10%> (+0.50%)	⬆️
aquadoggo/src/db/stores/document.rs	91.44% <100.00%> (-0.34%)	⬇️
aquadoggo/src/db/stores/entry.rs	96.26% <100.00%> (+0.18%)	⬆️
aquadoggo/src/db/stores/log.rs	96.42% <100.00%> (ø)
aquadoggo/src/db/stores/operation.rs	85.43% <100.00%> (+0.09%)	⬆️
aquadoggo/src/db/stores/schema.rs	96.15% <100.00%> (+0.15%)	⬆️
aquadoggo/src/db/stores/task.rs	91.52% <100.00%> (ø)
aquadoggo/src/graphql/client/dynamic_query.rs	96.36% <100.00%> (+0.13%)	⬆️
... and 21 more

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