Treating Summary and Histogram metric with out "_sum" counter as valid metric.

[sankala-dremio]

Description:
Fixing a bug - PrometheusReceiver ignores Summary and Histogram Metrics that do not have _sum counter. #2661

Modified the condition in toDistributionTimeSeries and toSummaryTimeSeries functions to ignore the hasSum check.

Link to tracking Issue:
#2661

Testing:
Updated Unit test cases, and also tested with live application using DropWizard metrics framework.

Documentation:
None.

Please delete paragraphs that you did not use before submitting.

[codecov]

Codecov Report

Merging #2812 (26e70a0) into main (e3c5965) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2812   +/-   ##
=======================================
  Coverage   91.67%   91.67%           
=======================================
  Files         293      293           
  Lines       15635    15635           
=======================================
  Hits        14333    14333           
  Misses        891      891           
  Partials      411      411           

Impacted Files	Coverage Δ
...ceiver/prometheusreceiver/internal/metricfamily.go	98.84% <100.00%> (ø)

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.