…-encoding fix (#335)

* Cherry-pick PR #293 + #306: dev tarball Docker tag fix and double URL-encoding fix

- build/ci_build: replace '+' with '.' in rocm_ver_tag and rocm_version_tag for valid Docker tags
- jax_rocm_plugin/build/rocm/ci_build: ROCM_VERSION_EXTRA use replace('+', '.')
- tools/get_rocm.py: unquote then quote therock URL to avoid double-encoding; create amdgcn symlink only if missing

Made-with: Cursor

* Fix pylint C0301: shorten comment line (line-too-long 103/100)

Made-with: Cursor

* Use try/except FileExistsError for amdgcn symlink (PR #330)

Made-with: Cursor

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Co-authored-by: Jenkins <jenkins-compute@amd.com>
(cherry picked from commit ea9a021)

On WSL, ROCm GPU discovery via KFD topology is unavailable, which can
cause plugin initialization to fail.
This change adds a WSL-specific fast path in GPU counting: when /dev/dxg
exists, it returns 1 directly for initialization gating.
The existing KFD-based counting logic remains unchanged for other
environments, and the docstring is updated to clearly document this
intentional hardcoded behavior.

Signed-off-by: Flora Cui <flora.cui@amd.com>
(cherry picked from commit ab4424b)

(cherry picked from commit 33fbb4b)

(cherry picked from commit 7fe4055)

(cherry picked from commit fd00e03)

(cherry picked from commit 1c21e42)

(cherry picked from commit 1c21914)