[SPIR-V] SPIR-V Backend must generate a valid OCL version if working in OpenCL environment (#89199)

If there is no information about OpenCL version we are forced to
generate OpenCL 1.0 by default for the OpenCL environment to avoid
puzzling run-times with Unknown/0.0 version output. For a reference,
LLVM-SPIRV Translator avoids potential issues with run-times in a
similar manner.