Fix global rateCollector init multiple times

[congqixia]

Related to #23701 /kind bug Signed-off-by: Congqi Xia [email protected]

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[codecov[bot]]

Codecov Report

Merging #23703 (0c2c46b) into master (4fb8919) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #23703      +/-   ##
==========================================
+ Coverage   82.11%   82.15%   +0.03%     
==========================================
  Files         742      742              
  Lines       96994    96999       +5     
==========================================
+ Hits        79647    79688      +41     
+ Misses      14378    14354      -24     
+ Partials     2969     2957      -12     

Impacted Files	Coverage Δ
internal/datanode/data_node.go	73.59% <100.00%> (-0.08%)	:arrow_down:
internal/datanode/rate_collector.go	91.17% <100.00%> (+1.89%)	:arrow_up:

... and 18 files with indirect coverage changes

[jiaoew1991]

/lgtm