Ignition -> Gazebo

[jennuine]

🦟 Bug fix

Part of:

• Increase test coverage gz-sim#1575
• Rename Ignition to Gazebo gazebo-tooling/release-tools#698

Summary

Updated links and naming

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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

Merging #273 (fd427eb) into ign-msgs5 (97ea6f5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           ign-msgs5     #273   +/-   ##
==========================================
  Coverage      85.27%   85.27%           
==========================================
  Files              9        9           
  Lines            903      903           
==========================================
  Hits             770      770           
  Misses           133      133           

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[chapulina]

Just a nit