fix unexpected score in look aside balancer

[weiliu1031]

Signed-off-by: Wei Liu wei.liu@zilliz.com
issue #25452

to avoid unexpected negative executingNq/totalNq, which causes the balancer uses a max float64 value as score, caused a unbalanced request assignment

[weiliu1031]

/kind improvement

[codecov]

Codecov Report

Merging #26213 (c3baaf6) into master (b6effd7) will decrease coverage by 0.02%.
Report is 32 commits behind head on master.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #26213      +/-   ##
==========================================
- Coverage   82.58%   82.57%   -0.02%     
==========================================
  Files         811      811              
  Lines      108695   108712      +17     
==========================================
  Hits        89770    89770              
- Misses      15798    15813      +15     
- Partials     3127     3129       +2     

Files Changed	Coverage Δ
internal/proxy/look_aside_balancer.go	96.91% <100.00%> (+0.20%)	⬆️
pkg/metrics/proxy_metrics.go	100.00% <100.00%> (ø)

... and 16 files with indirect coverage changes

[jiaoew1991]

/lgtm
/approve

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