[ign -> gz] CMake functions

[chapulina]

• Part of CMake API from ign to gz gazebo-tooling/release-tools#719

[codecov]

Codecov Report

Merging #422 (4ffaa9e) into main (2c5d186) will increase coverage by 34.12%.
The diff coverage is 47.32%.

@@             Coverage Diff             @@
##             main     #422       +/-   ##
===========================================
+ Coverage   30.03%   64.15%   +34.12%     
===========================================
  Files          43       45        +2     
  Lines        1888     5518     +3630     
===========================================
+ Hits          567     3540     +2973     
- Misses       1321     1978      +657     

Impacted Files	Coverage Δ
include/gz/gui/GuiEvents.hh	100.00% <ø> (ø)
include/gz/gui/Helpers.hh	77.77% <ø> (ø)
include/gz/gui/MainWindow.hh	100.00% <ø> (ø)
include/gz/gui/Plugin.hh	100.00% <ø> (ø)
src/Dialog.cc	68.42% <0.00%> (ø)
src/DragDropModel.cc	100.00% <ø> (ø)
src/SearchModel.cc	96.55% <ø> (ø)
...interactive_view_control/InteractiveViewControl.hh	100.00% <ø> (ø)
src/plugins/minimal_scene/MinimalScene.hh	100.00% <ø> (ø)
src/plugins/minimal_scene/MinimalSceneRhi.cc	0.00% <ø> (ø)
... and 121 more

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[methylDragon]

Stack builds with this 👌

[methylDragon]

Note:
I'm not sure if I saw: 39 - INTEGRATION_Examples_TEST (Subprocess aborted) before

It definitely didn't appear in the env var PR: https://github.com/gazebosim/gz-gui/runs/6766316540?check_suite_focus=true

[chapulina]

I'm not sure if I saw: 39 - INTEGRATION_Examples_TEST (Subprocess aborted) before

That's flaky, it may be better once we forward-port #419 🤞🏽 One way to verify this is that it failed in one of the Jammy builds but not the other.