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 #276 (c53ba47) into ign-fuel-tools4 (5146db9) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           ign-fuel-tools4     #276   +/-   ##
================================================
  Coverage            76.15%   76.15%           
================================================
  Files                   19       19           
  Lines                 2718     2718           
================================================
  Hits                  2070     2070           
  Misses                 648      648           

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This isn't implemented in citadel, only in garden. If it's backported later on we can update it then