[Fix]: honor NIXL_BACKENDS env for streaming RDMA

[h-guo18]

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[codecov]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.12%. Comparing base (72651b2) to head (b3a8a6e).

Files with missing lines	Patch %	Lines
...peculative/plugins/rdma_hidden_states_connector.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1862      +/-   ##
==========================================
- Coverage   74.12%   74.12%   -0.01%     
==========================================
  Files         515      515              
  Lines       57118    57121       +3     
==========================================
+ Hits        42338    42339       +1     
- Misses      14780    14782       +2     

Flag	Coverage Δ
unit	54.90% <40.00%> (-0.02%)	⬇️

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[h-guo18]

Superseded by #1846, which already contains the identical NIXL_BACKENDS env change in both hf_streaming_dataset.py and rdma_hidden_states_connector.py. Closing to avoid a merge conflict between the two.