faiss hnsw: get rid of a debugging config option

[alexanderguzhva]

Just a small cleanup

/kind improvement

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.66%. Comparing base (3c46f4c) to head (4319625).
Report is 211 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #875       +/-   ##
=========================================
+ Coverage      0   77.66%   +77.66%     
=========================================
  Files         0       84       +84     
  Lines         0     6361     +6361     
=========================================
+ Hits          0     4940     +4940     
- Misses        0     1421     +1421     

see 84 files with indirect coverage changes

[liliu-z]

Talked offline. This is for original HNSW impl removing for now
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[liliu-z]

Manually merged. Don't know why e2e and e2e-sse didn't get triggered.
@cydrain plz take a check