[sdk-metrics] Pass all tags supplied at measurement to ExemplarReservoir.Offer methods

[CodeBlanch]

Changes

• Pass all tags supplied at measurement to ExemplarReservoir.Offer methods to make the promise true.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.71%. Comparing base (6250307) to head (2131ca0).
Report is 114 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5414      +/-   ##
==========================================
+ Coverage   83.38%   84.71%   +1.32%     
==========================================
  Files         297      281      -16     
  Lines       12531    12101     -430     
==========================================
- Hits        10449    10251     -198     
+ Misses       2082     1850     -232     

Flag	Coverage Δ
unittests	?
unittests-Solution-Experimental	84.72% <100.00%> (?)
unittests-Solution-Stable	84.68% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/OpenTelemetry/Metrics/AggregatorStore.cs	85.21% <100.00%> (+4.82%)	⬆️
src/OpenTelemetry/Metrics/Exemplar/Exemplar.cs	95.65% <100.00%> (-4.35%)	⬇️

... and 55 files with indirect coverage changes