Use Stopwatch.StartNew()

[mic-max]

Use Stopwatch.StartNew(); instead of new Stopwatch(); sw.Start();

This was the only occurrence other than in MetricAPITest.cs which I am working on changing in another branch

[bruno-garcia]

This was the only occurrence other than in MetricAPITest.cs which I am working on changing in another branch

Ideally that would land here too and you'd pull main into your branch. So changes stay within their designated PR (i.e: feature not mixed with refactoring)

[codecov]

Codecov Report

Merging #2403 (9a9a330) into main (15981df) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2403   +/-   ##
=======================================
  Coverage   80.21%   80.21%           
=======================================
  Files         232      232           
  Lines        7492     7492           
=======================================
  Hits         6010     6010           
  Misses       1482     1482           

Impacted Files	Coverage Δ
...Zipkin/Implementation/ZipkinExporterEventSource.cs	63.63% <0.00%> (-9.10%)	⬇️
...ZPages/Implementation/ZPagesExporterEventSource.cs	62.50% <0.00%> (+6.25%)	⬆️