Use ! in place of not keyword for Pilz and CHOMP planners (backport #3217)

[mergify]

Description

While compiling this package on Windows (see RoboStack/ros-humble#241), the Windows compilation was failing as depending on the compilation options not may not be supported in MSVC depending on the compilation options.

Anyhow, as everywhere else in the code ! is used, I think it make sense to be consistent and use ! also here.

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

---

This is an automatic backport of pull request #3217 done by [Mergify](https://mergify.com).

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Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.19%. Comparing base (f820ea4) to head (74e73b5).
Report is 2 commits behind head on jazzy.

Files with missing lines	Patch %	Lines
...s/chomp/chomp_motion_planner/src/chomp_planner.cpp	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #3222      +/-   ##
==========================================
- Coverage   44.19%   44.19%   -0.00%     
==========================================
  Files         698      698              
  Lines       61586    61585       -1     
  Branches     7460     7459       -1     
==========================================
- Hits        27214    27210       -4     
- Misses      34205    34207       +2     
- Partials      167      168       +1     

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