Use memory size flag to activate dyn queue size feature

[jpkrohling]

Which problem is this PR solving?

• One more place was using the warmup flag to activate the dynamic queue size. This PR changes that to use the dynQueueSizeMemory value instead, as it's the only one explicitly set by users.

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[objectiser]

LGTM - although need to fix ci.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@c29449a). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2059   +/-   ##
=========================================
  Coverage          ?   97.41%           
=========================================
  Files             ?      207           
  Lines             ?    10307           
  Branches          ?        0           
=========================================
  Hits              ?    10041           
  Misses            ?      223           
  Partials          ?       43

Impacted Files	Coverage Δ
cmd/collector/app/span_processor.go	100% <100%> (ø)

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