Fix aiter availability check

[lauri9]

What does this PR do?

This PR updates the package availability check for aiter to use get_dist_name=True to correctly detect the availability of the package. AITER recently changed the distribution name of the package from aiter to amd-aiter in ROCm/aiter@2c6ff6c . After this, the import name and distribution name of the package differ, making the fix in this PR necessary.

Tested on aiter commit 7c0c84f:

main branch:

> _is_package_available("aiter")
(False, 'N/A')

This PR:

>_is_package_available("aiter", get_dist_name=True)
(True, '0.1.11.dev1+g7c0c84fe7')

Tested on older aiter commit de14bec to verify it also still works:

> _is_package_available("aiter", get_dist_name=True)
(True, '0.1.8.dev0+gde14bec0c.d20260122')

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