chore: mark db-dependent tests as needing to run in integration

[jesse-amano-hpe]

Description

The definition of db.ResolveTestPostgres() is in a file marked with // +build integration and therefore files that reference it fail to compile when that file is ignored (e.g. when running make test).

The agent test does not directly access the DB, but it ends up spinning up some goroutine somewhere that attempts to use an uninitialized Bun() and panics (presumably, because there's no DB available to satisfy the initialization of The One Bun in time). When it's run as part of make test-intg instead, it passes.

These tests would always run with integration tests anyway, all this changes is that they're ignored if you're only running "unit tests" or some select subset of tests that need to ignore these files in order to compile correctly.

Test Plan

Automated tests still pass

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.80%. Comparing base (e4bc377) to head (2f2ba7a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9041      +/-   ##
==========================================
- Coverage   47.80%   47.80%   -0.01%     
==========================================
  Files        1161     1161              
  Lines      143646   143646              
  Branches     2373     2373              
==========================================
- Hits        68673    68671       -2     
- Misses      74820    74822       +2     
  Partials      153      153              

Flag	Coverage Δ
backend	42.93% <ø> (-0.02%)	⬇️
harness	63.85% <ø> (+<0.01%)	⬆️
web	40.90% <ø> (ø)

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see 4 files with indirect coverage changes

[amandavialva01]

LGTM nice work, thanks for adding this so that we can still unit test locally!

[carolinaecalderon]

LGTM