ENO api fallback to hc-eni-host path

[BSWANG]

Note

Introduces a more robust VF discovery and simplifies RPC/CNI VF handling.

• RPC API change: removes VfType enum/field from rpc.proto; ENIInfo now only carries optional VfId (regenerated rpc.pb.go/* files; protoc version bump)
• CNI/VF setup: prepareVF no longer takes/derives VfType; always sets up VF via vf.SetupDriverAndGetNetInterface using VfId
• VF driver: GetBDFbyVFID now auto-selects config path between /var/rdma/eni_topo and /var/run/hc-eni-host/vf-topo-vpc; exposes config path vars and adds comprehensive tests
• ENI remote: stop mapping annotations to VfType; propagate VfId from status only
• Tests: updated across eni and plugin/terway to reflect API/signature changes and new VF path fallback

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[cursor]

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.46%. Comparing base (c1afe28) to head (ee19cc4).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
plugin/driver/vf/vf.go	71.42%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #954      +/-   ##
==========================================
+ Coverage   61.30%   61.46%   +0.15%     
==========================================
  Files         133      133              
  Lines       16639    16632       -7     
==========================================
+ Hits        10201    10223      +22     
+ Misses       5231     5202      -29     
  Partials     1207     1207              

Flag	Coverage Δ
unittests	61.46% <80.00%> (+0.15%)	⬆️

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