Better handle failures in CI infra (#3098)

* Update Jenkinsfile
* Update tests/catch/unit/CMakeLists.txt

[ROCm/hip-tests commit: 7ba53cd5da]

projects/hip-tests/catch/unit/CMakeLists.txt

@@ -34,6 +34,6 @@ add_subdirectory(multiThread)
 add_subdirectory(compiler)
 add_subdirectory(errorHandling)
 add_subdirectory(cooperativeGrps)
-if(HIP_PLATFORM STREQUAL "amd")
+if(HIP_PLATFORM STREQUAL "amd" AND NOT DEFINED CI_DISABLE_TESTBUILD)
 add_subdirectory(clock)
 endif()