[chore] Nit-fix exporter.request.MergeSplit()

[sfc-gh-sili]

Description

This PR fixes how capacityLimit is updated in exporter.request.MergeSplit().

Before

		if srcReq.ld.LogRecordCount() <= capacityLeft {
			if destReq == nil {
				destReq = srcReq
			} else {
				srcReq.ld.ResourceLogs().MoveAndAppendTo(destReq.ld.ResourceLogs())
			}
			capacityLeft -= destReq.ld.LogRecordCount()
			continue
		}

After

		srcCount := srcReq.ld.LogRecordCount()
		if srcCount <= capacityLeft {
			if destReq == nil {
				destReq = srcReq
			} else {
				srcReq.ld.ResourceLogs().MoveAndAppendTo(destReq.ld.ResourceLogs())
			}
			capacityLeft -= srcCount
			continue
		}

With that said, the original implementation does not cause any bug because "the larger for loop" loops through only two items. In the first loop, destReq is guaranteed to be nil, so capacityLeft is updated properly. In the second loop, we jump out of the loop immediately so the accuracy of capacityLeft does not matter any more.

Link to tracking issue

NA

Testing

NA

Documentation

NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.70%. Comparing base (e5e12bf) to head (0974ea4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12016   +/-   ##
=======================================
  Coverage   91.70%   91.70%           
=======================================
  Files         447      447           
  Lines       23728    23732    +4     
=======================================
+ Hits        21759    21763    +4     
  Misses       1600     1600           
  Partials      369      369           

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