fix(fake_test_node, osqp_interface, qp_interface): remove unnecessary cppcheck inline suppressions

[veqcc]

Description

This is a fix based on cppcheck warnings.

common/fake_test_node/test/test_fake_test_node.cpp:101:0: information: Unmatched suppression: syntaxError [unmatchedSuppression]
  ::testing::Values(-5, 0, 42));
^
common/osqp_interface/test/test_osqp_interface.cpp:41:0: information: Unmatched suppression: syntaxError [unmatchedSuppression]
TEST(TestOsqpInterface, BasicQp)
^
common/qp_interface/test/test_osqp_interface.cpp:41:0: information: Unmatched suppression: syntaxError [unmatchedSuppression]
TEST(TestOsqpInterface, BasicQp)
^
common/qp_interface/test/test_proxqp_interface.cpp:42:0: information: Unmatched suppression: syntaxError [unmatchedSuppression]
TEST(TestProxqpInterface, BasicQp)
^

There is no need to suppress cppcheck errors in test directories since they are out of scope of cppcheck CI.

Related links

Parent Issue:

• Link

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 28.64%. Comparing base (a195201) to head (84db1e1).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7855      +/-   ##
==========================================
- Coverage   28.65%   28.64%   -0.02%     
==========================================
  Files        1587     1592       +5     
  Lines      116361   116416      +55     
  Branches    49686    49688       +2     
==========================================
- Hits        33347    33346       -1     
- Misses      73974    74031      +57     
+ Partials     9040     9039       -1     

Flag	Coverage Δ		*Carryforward flag
differential	19.06% <ø> (?)
total	28.65% <ø> (-0.01%)	⬇️	Carriedforward from a195201

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[veqcc]

@rej55 @maxime-clem @satoshi-ota @takayuki5168
Please approve it!!