Prepare for 8.1.0 Release

[azeey]

🎈 Release

Preparation for 8.1.0 release.

Comparison to 8.0.0: gz-gui8_8.0.0...gz-gui8

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 70.09%. Comparing base (125a5ea) to head (68427a5).

Additional details and impacted files

@@           Coverage Diff            @@
##           gz-gui8     #612   +/-   ##
========================================
  Coverage    70.09%   70.09%           
========================================
  Files           39       39           
  Lines         5363     5363           
========================================
  Hits          3759     3759           
  Misses        1604     1604           

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