DEVX-460 make metrics more precise for values below 0 ms

[lojzatran]

https://commercetools.atlassian.net/browse/DEVX-460

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 10.06%. Comparing base (de78e1b) to head (903d93b).

Files with missing lines	Patch %	Lines
...onitoring/newrelic/NewrelicResponseSerializer.java	0.00%	8 Missing ⚠️
...opentelemetry/OpenTelemetryResponseSerializer.java	0.00%	8 Missing ⚠️
...ring/datadog/statsd/DatadogResponseSerializer.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #772      +/-   ##
============================================
- Coverage     10.06%   10.06%   -0.01%     
  Complexity     1944     1944              
============================================
  Files          6817     6817              
  Lines         66619    66621       +2     
  Branches        279      279              
============================================
  Hits           6704     6704              
- Misses        59741    59743       +2     
  Partials        174      174              

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