test(SPV-1549): refactor txfixture into testability.

[dorzepowski]

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[github-actions]

Manual Tests

💚 Manual testing by @wregulski resulted in success.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 32.89474% with 51 lines in your changes missing coverage. Please review.

Project coverage is 35.45%. Comparing base (1c04eb0) to head (df0be9e).

Files with missing lines	Patch %	Lines
...egrationtests/testabilities/fixture_user_actors.go	0.00%	14 Missing ⚠️
engine/testabilities/fixture_engine.go	0.00%	12 Missing ⚠️
engine/tester/fixtures/txtestability/fixture_tx.go	80.64%	6 Missing ⚠️
engine/testabilities/fixture_faucet.go	0.00%	4 Missing ⚠️
...ster/fixtures/txtestability/ability_transaction.go	0.00%	3 Missing ⚠️
...tlines/testabilities/assert_outline_transaction.go	0.00%	3 Missing ⚠️
...ernal/sql/testabilities/fixture_inputs_selector.go	0.00%	3 Missing ⚠️
...ons/testabilities/fixture_spvwallet_application.go	0.00%	2 Missing ⚠️
.../integrationtests/testabilities/ability_actions.go	0.00%	1 Missing ⚠️
...ternal/testabilities/assert_transaction_details.go	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #940      +/-   ##
==========================================
- Coverage   35.63%   35.45%   -0.18%     
==========================================
  Files         424      425       +1     
  Lines       20035    20060      +25     
==========================================
- Hits         7139     7113      -26     
- Misses      12299    12355      +56     
+ Partials      597      592       -5     

Flag	Coverage Δ
unittests	35.45% <32.89%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
.../integrationtests/testabilities/ability_actions.go	0.00% <0.00%> (ø)
...ternal/testabilities/assert_transaction_details.go	0.00% <0.00%> (ø)
engine/tester/fixtures/unlocking_resolver.go	0.00% <0.00%> (-61.91%)	⬇️
...on/outlines/testabilities/assert_outline_output.go	0.00% <0.00%> (ø)
...ons/testabilities/fixture_spvwallet_application.go	0.00% <0.00%> (ø)
...ster/fixtures/txtestability/ability_transaction.go	0.00% <0.00%> (ø)
...tlines/testabilities/assert_outline_transaction.go	0.00% <0.00%> (ø)
...ernal/sql/testabilities/fixture_inputs_selector.go	0.00% <0.00%> (ø)
engine/testabilities/fixture_faucet.go	0.00% <0.00%> (ø)
engine/tester/fixtures/txtestability/fixture_tx.go	78.44% <80.64%> (ø)
... and 2 more

... and 1 file with indirect coverage changes

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