Unify test_utils

[sandreae]

Move all test utils into one module.

closes: #274

📋 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: 94.22% // No change to project coverage 👍

Coverage data is based on head (0bfc05f) compared to base (6815cf4).
Patch coverage: 94.11% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #275   +/-   ##
=======================================
  Coverage   94.22%   94.22%           
=======================================
  Files          61       62    +1     
  Lines        5144     5144           
=======================================
  Hits         4847     4847           
  Misses        297      297           

Impacted Files	Coverage Δ
aquadoggo/src/db/stores/document.rs	91.78% <ø> (ø)
aquadoggo/src/db/stores/entry.rs	96.07% <ø> (ø)
aquadoggo/src/db/stores/log.rs	96.42% <ø> (ø)
aquadoggo/src/db/stores/operation.rs	85.33% <ø> (ø)
aquadoggo/src/db/stores/schema.rs	96.00% <ø> (ø)
aquadoggo/src/db/stores/task.rs	91.52% <ø> (ø)
aquadoggo/src/graphql/client/dynamic_query.rs	96.22% <ø> (ø)
...quadoggo/src/graphql/client/dynamic_types/tests.rs	100.00% <ø> (ø)
aquadoggo/src/graphql/client/mutation.rs	100.00% <ø> (ø)
aquadoggo/src/graphql/client/static_query.rs	100.00% <ø> (ø)
... and 17 more

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