test(autoware_osqp_interface): add tests for missed lines

[NorahXiong]

Description

Related links

Parent Issue:

#164

How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.59%. Comparing base (4cb18f5) to head (6f43203).
Report is 88 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
+ Coverage   78.75%   82.59%   +3.83%     
==========================================
  Files          11        3       -8     
  Lines         193      247      +54     
  Branches       73      102      +29     
==========================================
+ Hits          152      204      +52     
- Misses         11       18       +7     
+ Partials       30       25       -5     

Flag	Coverage Δ
differential	82.59% <ø> (?)
total	?

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