keep histograms in envoy prometheus receiver

[jinja2]

Description:

The current config for prometheus receiver for Envoy in discovery mode is not matching with histogram metrics. This PR updates the config to additional keep metrics which match with the histogram suffixes.

Testing:
Update the tests with histogram metrics received

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.84%. Comparing base (cac6324) to head (c1b8a22).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6243      +/-   ##
==========================================
- Coverage   44.88%   44.84%   -0.05%     
==========================================
  Files         390      390              
  Lines       26983    26983              
==========================================
- Hits        12112    12100      -12     
- Misses      14003    14013      +10     
- Partials      868      870       +2     

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