GoogleTest: Honor TEST_LAUNCHER in gtest_discover_tests

rhabackerrequested to merge
rhabacker/cmake:fix-issue-25603 into master

We run test executables to discover tests. Use the same launchers that are used to run the tests. We already handle CROSSCOMPILING_EMULATOR. Update the logic to account for the TEST_LAUNCHER property added by !8963 (merged), and for the CROSSCOMPILING_EMULATOR behavior change in !8947 (merged).

Fixes: #25603 (closed)
Topic-rename: GoogleTest-test-launcher

Edited by Brad King

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