Install gz packages instead of ignition

[chapulina]

• Similar to Install python3-gz-math7 instead of ignition sdformat#1092

Summary

That ignition there messes up with the sed command we have searching for gz in the install tutorial:

https://github.com/gazebosim/docs/blob/master/garden/install_ubuntu_src.md#install-dependencies

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.

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[codecov]

Codecov Report

Merging #1614 (b7970f4) into main (a3cbd8c) will decrease coverage by 0.01%.
The diff coverage is 99.24%.

@@            Coverage Diff             @@
##             main    #1614      +/-   ##
==========================================
- Coverage   63.62%   63.61%   -0.02%     
==========================================
  Files         330      330              
  Lines       25787    25931     +144     
==========================================
+ Hits        16408    16495      +87     
- Misses       9379     9436      +57     

Impacted Files	Coverage Δ
include/gz/sim/EventManager.hh	79.16% <ø> (ø)
include/gz/sim/Util.hh	100.00% <ø> (ø)
include/gz/sim/components/Serialization.hh	95.55% <ø> (ø)
include/gz/sim/components/Factory.hh	97.53% <80.00%> (-1.18%)	⬇️
include/gz/sim/EntityComponentManager.hh	100.00% <100.00%> (ø)
include/gz/sim/Link.hh	100.00% <100.00%> (ø)
include/gz/sim/Model.hh	100.00% <100.00%> (ø)
include/gz/sim/SdfEntityCreator.hh	100.00% <100.00%> (ø)
include/gz/sim/Server.hh	100.00% <100.00%> (ø)
include/gz/sim/ServerConfig.hh	100.00% <100.00%> (ø)
... and 122 more

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