Drop delta metrics in prometheus exporter

[jack-berg]

Resolves #5015.

[codecov]

Codecov Report

Base: 91.24% // Head: 91.22% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (33b1cba) compared to base (16a02b2).
Patch coverage: 77.77% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5062      +/-   ##
============================================
- Coverage     91.24%   91.22%   -0.03%     
- Complexity     4883     4890       +7     
============================================
  Files           553      553              
  Lines         14449    14454       +5     
  Branches       1379     1380       +1     
============================================
+ Hits          13184    13185       +1     
- Misses          878      880       +2     
- Partials        387      389       +2     

Impacted Files	Coverage Δ
.../opentelemetry/exporter/prometheus/Serializer.java	87.93% <71.42%> (-0.41%)	⬇️
...ntelemetry/exporter/prometheus/PrometheusType.java	90.90% <100.00%> (-0.76%)	⬇️
...metry/sdk/metrics/export/PeriodicMetricReader.java	87.14% <0.00%> (-2.86%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.