Removed Ignition

[nkoenig]

🎉 New feature

This removes Ignition from gz-launch.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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 #223 (ca5b40c) into main (76b4ba6) will increase coverage by 1.20%.
The diff coverage is 100.00%.

❗ Current head ca5b40c differs from pull request most recent head f0b1800. Consider uploading reports for the commit f0b1800 to get more accurate results

@@            Coverage Diff             @@
##             main     #223      +/-   ##
==========================================
+ Coverage   56.90%   58.10%   +1.20%     
==========================================
  Files           3        3              
  Lines         413      401      -12     
==========================================
- Hits          235      233       -2     
+ Misses        178      168      -10     

Files Changed	Coverage Δ
src/Manager.cc	55.10% <100.00%> (+1.37%)	⬆️

[mjcarroll]

One typo

[nkoenig]

One typo

Fixed.