re-enable cmake warnings (#3028) (backport #3172)

[mergify]

Description

I think we should be able to do this now

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 #3172 done by [Mergify](https://mergify.com).

[mikeferguson]

Good call - I didn't even think about backporting it

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.07%. Comparing base (e94c891) to head (0334948).
Report is 2 commits behind head on jazzy.

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Additional details and impacted files

@@            Coverage Diff             @@
##            jazzy    #3173      +/-   ##
==========================================
- Coverage   44.07%   44.07%   -0.00%     
==========================================
  Files         698      698              
  Lines       61535    61539       +4     
  Branches     7457     7458       +1     
==========================================
+ Hits        27115    27116       +1     
- Misses      34252    34255       +3     
  Partials      168      168              

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[mikeferguson]

Apparently, we've still got issues on Jazzy:

  In file included from /home/runner/work/moveit2/moveit2/.work/target_ws/src/moveit2/moveit_ros/moveit_servo/src/servo_node.cpp:42:
  /opt/ros/jazzy/include/realtime_tools/realtime_tools/thread_priority.hpp:39:2: error: #warning "This header include is deprecated. Please update your code to use 'realtime_helpers.hpp' header and link against 'realtime_tools' library." [-Werror=cpp]

[sea-bass]

Ah yeah, there's another bit of code to backport. Will add it to this PR

[mikeferguson]

@sea-bass thanks for figuring out the build error