standalone_gtest_setup example fails to build on mac

[scpeters]

Environment

• OS Version: macos 13.6.3-x86_64
• Source or binary build? source of gz-sim9 since 3bdadad

Description

• Expected behavior: the standalone_gtest_setup example should build on macOS, as it builds successfully on Ubuntu was building successfully on macOS until recently. Since there were no related changes in the first build in which it began to fail, I looked for additional differences in the console log, and the most relevant difference is that cmake updated from 3.31.6 to 4.0.0 when the test started failing
• Actual behavior: the example fails to build with a cmake error in gtest_discover_tests_impl

Steps to reproduce

1. Install gz-sim9 on macOS
2. Attempt to build standalone_gtest_setup example

Output

135: [ 41%] Building CXX object CMakeFiles/command_TEST.dir/command_TEST.cc.o
135: [ 50%] Linking CXX executable command_TEST
135: dyld[22146]: Symbol not found: __ZN2gz3sim2v910components7Factory8InstanceEv
135:   Referenced from: <0854A3DC-E052-3C00-91F5-8D9FCC53E1B2> /private/var/folders/ng/v8gtqrqs1sj3dzz5pvh558mh0000gp/T/gz/temp_dirlCZu4K/command_TEST
135:   Expected in:     <no uuid> unknown
135: CMake Error at /usr/local/share/cmake/Modules/GoogleTestAddTests.cmake:132 (message):
135:   Error running test executable.
135: 
135:     Path: '/private/var/folders/ng/v8gtqrqs1sj3dzz5pvh558mh0000gp/T/gz/temp_dirlCZu4K/command_TEST'
135:     Working directory: '/private/var/folders/ng/v8gtqrqs1sj3dzz5pvh558mh0000gp/T/gz/temp_dirlCZu4K'
135:     Result: Subprocess aborted
135:     Output:
135:       
135: 
135: Call Stack (most recent call first):
135:   /usr/local/share/cmake/Modules/GoogleTestAddTests.cmake:275 (gtest_discover_tests_impl)
135: 
135: 
135: make[3]: *** [command_TEST] Error 1
135: make[3]: *** Deleting file `command_TEST'
135: make[2]: *** [CMakeFiles/command_TEST.dir/all] Error 2
135: make[1]: *** [all] Error 2
135: /Users/jenkins/jenkins-agent/workspace/gz_sim-ci-gz-sim9-homebrew-amd64/gz-sim/test/integration/examples_build.cc:114: Failure
135: Expected equality of these values:
135:   system("make")
135:     Which is: 512
135:   0
135: [  FAILED  ] Plugins/ExamplesBuild.Build/standalone_gtest_setup, where GetParam() = [standalone, gtest_setup] (16837 ms)

[scpeters]

The test failure may not be related to cmake 4.0; see discussion in #2892