Modules: Tolerate CMAKE_EXECUTE_PROCESS_COMMAND_ERROR_IS_FATAL

Capture `execute_process` calls' `RESULT_VARIABLE`.

We don't actually need to check the result as we presume the existing
logic is already adequate, and sometimes programs return non-zero values
as result of valid query.  I.e. this is a "safe" way to broadly protect
these scripts.

Issue: #27782

Modules/CMakeFindJavaCommon.cmake

@@ -22,6 +22,7 @@ else()
         OUTPUT_VARIABLE _CMD_JAVA_HOME
         OUTPUT_STRIP_TRAILING_WHITESPACE
         ERROR_QUIET
+        RESULT_VARIABLE _result_java_home
       )
     endif()
     if(_CMD_JAVA_HOME AND IS_DIRECTORY "${_CMD_JAVA_HOME}")