FMWK-850 Fix in-doubt counter for bacth writes

[filkeith]

• count in-doubt for batch operations

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.23810% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.08%. Comparing base (e315dab) to head (845d4fc).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
io/aerospike/record_batch_writer.go	95.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #355      +/-   ##
==========================================
- Coverage   81.16%   81.08%   -0.08%     
==========================================
  Files         109      109              
  Lines        8378     8392      +14     
==========================================
+ Hits         6800     6805       +5     
- Misses       1083     1087       +4     
- Partials      495      500       +5     

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[reugn]

Lines 139-141:

if aerr != nil && aerr.IsInDoubt() {
	rw.stats.IncrErrorsInDoubt()
}

should be removed, as the counter is per record.