[to dev/1.3] Make the root.__system database has a normal number of replicas (no longer forcing the replica to be 1)

[liyuheng55555]

cp #14127

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 41.13%. Comparing base (f3a06cc) to head (f06f465).
Report is 3 commits behind head on dev/1.3.

Files with missing lines	Patch %	Lines
.../service/thrift/ConfigNodeRPCServiceProcessor.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev/1.3   #15720   +/-   ##
==========================================
  Coverage      41.12%   41.13%           
  Complexity       198      198           
==========================================
  Files           3568     3568           
  Lines         231655   231651    -4     
  Branches       27657    27655    -2     
==========================================
+ Hits           95279    95295   +16     
+ Misses        136376   136356   -20     

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