Fix flaky test - TestSpanProcessorWithOnDroppedSpanOption

[yurishkuro]

• Resolves [Bug]: Flaky Test: TestSpanProcessorWithOnDroppedSpanOption #4450
• Alternative to Fix flaky test - TestSpanProcessorWithOnDroppedSpanOption #4451

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (015020d) 97.05% compared to head (44e5db3) 97.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4489      +/-   ##
==========================================
+ Coverage   97.05%   97.06%   +0.01%     
==========================================
  Files         300      300              
  Lines       17740    17813      +73     
==========================================
+ Hits        17217    17290      +73     
  Misses        419      419              
  Partials      104      104              

Flag	Coverage Δ
unittests	97.06% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/agent/app/reporter/grpc/reporter.go	100.00% <ø> (ø)
cmd/query/app/query_parser.go	100.00% <ø> (ø)
...in/sampling/strategystore/static/strategy_store.go	97.26% <ø> (ø)
plugin/metrics/prometheus/factory.go	100.00% <100.00%> (ø)
...trics/prometheus/metricsstore/dbmodel/to_domain.go	100.00% <100.00%> (ø)
plugin/metrics/prometheus/metricsstore/reader.go	100.00% <100.00%> (ø)
plugin/metrics/prometheus/options.go	100.00% <100.00%> (ø)

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