Use ConfigUtil internally

[jack-berg]

There are a few places where we read from system properties. This adjusts those to use ConfigUtil so that property names normalization occurs in a standard way.

[codecov]

Codecov Report

Base: 91.25% // Head: 91.24% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (8fc3864) compared to base (57595b0).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5048      +/-   ##
============================================
- Coverage     91.25%   91.24%   -0.01%     
+ Complexity     4894     4893       -1     
============================================
  Files           552      552              
  Lines         14481    14479       -2     
  Branches       1386     1385       -1     
============================================
- Hits          13214    13212       -2     
  Misses          878      878              
  Partials        389      389              

Impacted Files	Coverage Δ
...y/exporter/internal/marshal/CodedOutputStream.java	70.76% <33.33%> (-0.25%)	⬇️
...java/io/opentelemetry/api/GlobalOpenTelemetry.java	93.33% <100.00%> (ø)
...java/io/opentelemetry/api/internal/ConfigUtil.java	100.00% <100.00%> (ø)
...emetry/sdk/metrics/internal/debug/DebugConfig.java	100.00% <100.00%> (+10.00%)	⬆️

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