Garden: ensure targets exist before referencing

[scpeters]

🦟 Bug fix

Attempting to fix the windows build.

Summary

The windows build on Garden has been broken for a while due to an inability to find the ign-common av component. This has been fixed by gazebosim/gz-cmake#271, but there are still cmake issues with the windows build:

• https://build.osrfoundation.org/view/ign-garden/job/ign_gazebo-ci-win/207/

CMake Error at test/integration/CMakeLists.txt:167 (target_link_libraries):
  Cannot specify link libraries for target "INTEGRATION_log_system" which is
  not built by this project.

I've added if (TARGET <TARGET_NAME>) checks around each target_* call in test/integration/CMakeLists.txt that was missing it to see if that is enough to fix the windows build.

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.

[chapulina]

LGTM so far, even if it doesn't fix the build it's an improvement

[scpeters]

it now fails with linking errors

[2540.391s] ColladaWorldExporter.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: bool __cdecl gz::common::MeshManager::HasMesh(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)const " (__imp_?HasMesh@MeshManager@common@gz@@QEBA_NAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) [C:\Jenkins\workspace\ign_gazebo-pr-win\ws\build\gz-sim7\src\systems\collada_world_exporter\gz-sim7-collada-world-exporter-system.vcxproj]
[2540.391s] ColladaWorldExporter.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class gz::common::Mesh const * __cdecl gz::common::MeshManager::MeshByName(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)const " (__imp_?MeshByName@MeshManager@common@gz@@QEBAPEBVMesh@23@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) [C:\Jenkins\workspace\ign_gazebo-pr-win\ws\build\gz-sim7\src\systems\collada_world_exporter\gz-sim7-collada-world-exporter-system.vcxproj]
[2540.391s] ColladaWorldExporter.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: class gz::common::Mesh const * __cdecl gz::common::MeshManager::Load(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (__imp_?Load@MeshManager@common@gz@@QEAAPEBVMesh@23@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) [C:\Jenkins\workspace\ign_gazebo-pr-win\ws\build\gz-sim7\src\systems\collada_world_exporter\gz-sim7-collada-world-exporter-system.vcxproj]
...

attempting a fix in a92c232

[scpeters]

https://build.osrfoundation.org/job/ign_gazebo-pr-win/4686/

unstable!!!

[codecov]

Codecov Report

Merging #1578 (6a66b53) into main (a3cbd8c) will decrease coverage by 0.01%.
The diff coverage is 99.31%.

❗ Current head 6a66b53 differs from pull request most recent head a92c232. Consider uploading reports for the commit a92c232 to get more accurate results

@@            Coverage Diff             @@
##             main    #1578      +/-   ##
==========================================
- Coverage   63.62%   63.61%   -0.02%     
==========================================
  Files         330      330              
  Lines       25787    25923     +136     
==========================================
+ Hits        16408    16490      +82     
- Misses       9379     9433      +54     

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/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)
include/gz/sim/SystemLoader.hh	100.00% <100.00%> (ø)
... and 132 more

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