Improve aggregation concurrent safe tests

[dashpole]

I'm taking a stab at improving the ConcurrentSafe tests for aggregations before taking on the lockless exponential histogram implementation again.

Part of #7796

This PR includes a few improvements:

• All concurrent-safe tests now use 10 different attribute sets to make sure we are testing concurrent increments that result in an overflow (the cardinality limit of the test is 3).
• All concurrent-safe tests for floats now include decimal valued-inputs.
• Improved the validation of the collected metrics:
  • Validate the total after multiple collects.
  • Validate that increments are made to the correct bucket for histograms
  • Validate that the overflow attribute set has the correct total value.

This uncovered an apparent race condition where the lastvalue aggregation can collect a value of zero even when no zero-value is recorded. I added a TODO, and will fix this in a follow-up.

I used AI to help me design and implement tests, but requested each of the changes, and reviewed the output.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.6%. Comparing base (2ffde5a) to head (be30249).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #8021   +/-   ##
=====================================
  Coverage   81.6%   81.6%           
=====================================
  Files        304     304           
  Lines      23452   23452           
=====================================
  Hits       19141   19141           
- Misses      3928    3929    +1     
+ Partials     383     382    -1     

see 2 files with indirect coverage changes

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