fix(freespace_planner): disable randomly failing tests

[maxime-clem]

Description

Some tests in the autoware_freespace_planner package are randomly failing (both in the CI and locally).
This PR disable them so that they do not bother other PRs. A proper fix will be made later.

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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[takayuki5168]

@maxime-clem @mkquda
Thank you.
Please make Quda-san be the maintainer of packages he got familiar with.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (3d849e9) to head (b3ee80c).
Report is 999 commits behind head on main.

Files	Patch %	Lines
...ner/test/test_freespace_planner_node_interface.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #8337       +/-   ##
==========================================
- Coverage   15.09%   0.00%   -15.09%     
==========================================
  Files        1967     118     -1849     
  Lines      135941   12482   -123459     
  Branches    42122    1465    -40657     
==========================================
- Hits        20520       1    -20519     
+ Misses      92700   12481    -80219     
+ Partials    22721       0    -22721     

Flag	Coverage Δ
differential	<0.01% <0.00%> (?)
total	?

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