Prepare for 8.2.0 Release

[azeey]

🎈 Release

Preparation for 8.2.0 release.

Comparison to 8.1.0: gz-sim8_8.1.0...gz-sim8

Needed by <PR(s)>

Checklist

• Asked team if this is a good time for a release
• There are no changes to be ported from the previous major version
• No PRs targeted at this major version are close to getting in
• Bumped minor for new features, patch for bug fixes
• Updated changelog
• Updated migration guide (as needed)
• Link to PR updating dependency versions in appropriate repository in gazebo-release (as needed):

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.95%. Comparing base (b482a2d) to head (c5b41c8).

Additional details and impacted files

@@             Coverage Diff             @@
##           gz-sim8    #2335      +/-   ##
===========================================
- Coverage    65.95%   65.95%   -0.01%     
===========================================
  Files          327      327              
  Lines        31347    31347              
===========================================
- Hits         20676    20675       -1     
- Misses       10671    10672       +1     

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