Prepare for 7.1.0 Release

[azeey]

🎈 Release

Preparation for 7.1.0 release.

Comparison to 7.0.0: gz-physics7_7.0.0...gz-physics7

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 78.32%. Comparing base (b312755) to head (421c2b2).

Additional details and impacted files

@@             Coverage Diff              @@
##           gz-physics7     #607   +/-   ##
============================================
  Coverage        78.32%   78.32%           
============================================
  Files              140      140           
  Lines             8069     8069           
============================================
  Hits              6320     6320           
  Misses            1749     1749           

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