Nit improvements to batchprocessors

[cijothomas]

Incrementally changing, to keep reviews easier. Lot more work left.

[codecov]

Codecov Report

Attention: Patch coverage is 48.00000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 77.1%. Comparing base (ef49833) to head (f787817).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-sdk/src/logs/log_processor.rs	42.8%	12 Missing ⚠️
opentelemetry-sdk/src/metrics/periodic_reader.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #2466     +/-   ##
=======================================
- Coverage   77.2%   77.1%   -0.1%     
=======================================
  Files        124     124             
  Lines      23016   23021      +5     
=======================================
+ Hits       17770   17771      +1     
- Misses      5246    5250      +4     

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[utpilla]

Looks good with the error reason fixed. Approving the PR to unblock.