Add JAX version metadata to xspace #12654

Job	Run time
Bazel single accelerator CUDA tests / linux x86, jaxlib=head, CUDA=13, Python=3.14, x64=1, build_jax=true, build_jaxlib=true	8m 35s
Bazel single accelerator CUDA tests / linux x86, jaxlib=pypi_latest, CUDA=12, Python=3.11, x64=0, build_jax=true, build_jaxlib=false	7m 32s
Build CUDA artifacts / jax-cuda-pjrt, linux x86, py 3.14, cuda 13, clone main XLA=1	3m 56s
Build CUDA artifacts / jax-cuda-plugin, linux x86, py 3.14, cuda 13, clone main XLA=1	2m 46s
	22m 49s

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