Fix race condition when adding collector tags

[yurishkuro]

Hopefully resolves #3885

[codecov]

Codecov Report

Base: 97.61% // Head: 97.63% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (4a950c3) compared to base (1c97af0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3886      +/-   ##
==========================================
+ Coverage   97.61%   97.63%   +0.01%     
==========================================
  Files         293      293              
  Lines       17064    17070       +6     
==========================================
+ Hits        16657    16666       +9     
+ Misses        321      319       -2     
+ Partials       86       85       -1     

Impacted Files	Coverage Δ
cmd/collector/app/span_processor.go	100.00% <100.00%> (ø)
cmd/query/app/static_handler.go	98.19% <0.00%> (+1.80%)	⬆️

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