Update user_events metrics exporter to otel 0.27, add internal logs

[lalitb]

Fixes #
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[lalitb]

logged as debug here with extra details, it will be logged as error in PeriodicReader.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 117 lines in your changes missing coverage. Please review.

Project coverage is 55.4%. Comparing base (d407cbf) to head (53330ca).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntelemetry-user-events-metrics/src/exporter/mod.rs	0.0%	107 Missing ⚠️
...elemetry-user-events-metrics/src/tracepoint/mod.rs	0.0%	10 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #129     +/-   ##
=======================================
- Coverage   56.0%   55.4%   -0.7%     
=======================================
  Files         39      39             
  Lines       6037    6105     +68     
=======================================
  Hits        3385    3385             
- Misses      2652    2720     +68     

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[cijothomas]

Changelog update too.