[chore] Improve logs bytes batch

[bogdandrutu]

Before:

BenchmarkSplittingBasedOnItemCountManyLogsSlightlyAboveLimit
BenchmarkSplittingBasedOnItemCountManyLogsSlightlyAboveLimit-12    	      51	  23075717 ns/op	43531254 B/op	  700472 allocs/op
BenchmarkSplittingBasedOnByteSizeManyLogsSlightlyAboveLimit
BenchmarkSplittingBasedOnByteSizeManyLogsSlightlyAboveLimit-12    	      36	  32852065 ns/op	43601205 B/op	  702094 allocs/op

After:

BenchmarkSplittingBasedOnItemCountManyLogsSlightlyAboveLimit
BenchmarkSplittingBasedOnItemCountManyLogsSlightlyAboveLimit-12    	      50	  23387806 ns/op	43531234 B/op	  700471 allocs/op
BenchmarkSplittingBasedOnByteSizeManyLogsSlightlyAboveLimit
BenchmarkSplittingBasedOnByteSizeManyLogsSlightlyAboveLimit-12    	      30	  38350051 ns/op	43616507 B/op	  702427 allocs/op

[codecov]

Codecov Report

Attention: Patch coverage is 98.30508% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.02%. Comparing base (d510c86) to head (df738f9).

Files with missing lines	Patch %	Lines
exporter/exporterhelper/logs_batch.go	98.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12529      +/-   ##
==========================================
+ Coverage   92.00%   92.02%   +0.01%     
==========================================
  Files         469      469              
  Lines       25301    25318      +17     
==========================================
+ Hits        23279    23299      +20     
+ Misses       1614     1612       -2     
+ Partials      408      407       -1     

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