[mdatagen] Fix bug where Histograms were marked as not supporting temporaly aggregation

[bogdandrutu]

See https://github.com/open-telemetry/opentelemetry-proto/blob/main/opentelemetry/proto/metrics/v1/metrics.proto#L254

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.80%. Comparing base (6a546b2) to head (ccbb869).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12168      +/-   ##
==========================================
- Coverage   91.82%   91.80%   -0.02%     
==========================================
  Files         463      463              
  Lines       24774    24774              
==========================================
- Hits        22748    22745       -3     
- Misses       1644     1646       +2     
- Partials      382      383       +1     

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[codeboten]

surprised this change doesn't modify any generated code, i guess no components in core are using histograms?

[bogdandrutu]

Yes, very rarely used. I found it because I am trying to see if we can simplify the metrics testing, see #12167. But for telemetry so far we don't test temporality.