meta/tkv: skip updating nlink when the transactions conflict a lot

[SandyXSD]

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Codecov Report

Patch coverage: 84.00% and project coverage change: +0.11 🎉

Comparison is base (a230794) 55.43% compared to head (54608ea) 55.55%.

❗ Current head 54608ea differs from pull request most recent head 1780485. Consider uploading reports for the commit 1780485 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3285      +/-   ##
==========================================
+ Coverage   55.43%   55.55%   +0.11%     
==========================================
  Files         142      142              
  Lines       33741    33744       +3     
==========================================
+ Hits        18706    18745      +39     
+ Misses      13056    13013      -43     
- Partials     1979     1986       +7     

Impacted Files	Coverage Δ
pkg/meta/tkv.go	71.56% <66.66%> (-0.21%)	⬇️
pkg/meta/tkv_badger.go	73.38% <100.00%> (ø)
pkg/meta/tkv_etcd.go	77.58% <100.00%> (ø)
pkg/meta/tkv_fdb.go	79.41% <100.00%> (ø)
pkg/meta/tkv_mem.go	91.90% <100.00%> (ø)
pkg/meta/tkv_prefix.go	93.47% <100.00%> (ø)
pkg/meta/tkv_tikv.go	59.49% <100.00%> (ø)
pkg/vfs/writer.go	77.48% <0.00%> (-1.17%)	⬇️
pkg/meta/redis.go	66.81% <0.00%> (+0.03%)	⬆️
... and 4 more

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