Mecanum Drive: Populate the pose covariance matrix (backport #1772)

[mergify]

During recent testing I noticed that the pose covariance matrix was not being populated in the mecanum drive controller. This PR is to populate the covariance matrix in the message using the coordinating parameters in the same way that the twist covariance matrix is populated.

Once this is merged I do want to get it backported, I'm not certain what the process is for that.

---

This is an automatic backport of pull request #1772 done by Mergify.

[mergify]

Cherry-pick of 922e49b has failed:

On branch mergify/bp/jazzy/pr-1772
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You are currently cherry-picking commit 922e49b.
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Changes to be committed:
	modified:   mecanum_drive_controller/src/mecanum_drive_controller.cpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   mecanum_drive_controller/test/mecanum_drive_controller_params.yaml
	both modified:   mecanum_drive_controller/test/test_mecanum_drive_controller.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

This pull request is in conflict. Could you fix it @bmagyar @destogl @christophfroehlich @saikishor?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.05%. Comparing base (e88a52a) to head (28c57ea).
Report is 1 commits behind head on jazzy.

Additional details and impacted files

@@           Coverage Diff           @@
##            jazzy    #1807   +/-   ##
=======================================
  Coverage   85.05%   85.05%           
=======================================
  Files         127      127           
  Lines       12268    12273    +5     
  Branches     1041     1041           
=======================================
+ Hits        10434    10439    +5     
  Misses       1497     1497           
  Partials      337      337           

Flag	Coverage Δ
unittests	85.05% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
..._drive_controller/src/mecanum_drive_controller.cpp	91.08% <100.00%> (+0.03%)	⬆️
..._controller/test/test_mecanum_drive_controller.cpp	100.00% <100.00%> (ø)

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