test(autoware_qp_interface): add unit tests for initializeProblem

[NorahXiong]

Description

Related links

Parent Issue:

#173

How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

Thank you for contributing to the Autoware project!

🚧 If your pull request is in progress, switch it to draft mode.

Please ensure:

• You've checked our contribution guidelines.
• Your PR follows our pull request guidelines.
• All required CI checks pass before marking the PR ready for review.

[codecov]

Codecov Report

Attention: Patch coverage is 89.06250% with 7 lines in your changes missing coverage. Please review.

Project coverage is 61.42%. Comparing base (4cb18f5) to head (7615b4f).
Report is 63 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/autoware_qp_interface/test/test_qp_interface.cpp	89.06%	0 Missing and 7 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #237       +/-   ##
===========================================
- Coverage   78.75%   61.42%   -17.33%     
===========================================
  Files          11       10        -1     
  Lines         193      630      +437     
  Branches       73      384      +311     
===========================================
+ Hits          152      387      +235     
- Misses         11      116      +105     
- Partials       30      127       +97     

Flag	Coverage Δ
differential	61.42% <89.06%> (?)
total	?

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.