[exporter/splunkhec] Fix Capabilities with enabled batching (#35306) #10

Job	Run time
windows-unittest-matrix (receiver-0)	15m 10s
windows-unittest-matrix (receiver-1)	18m 39s
windows-unittest-matrix (receiver-2)	17m 39s
windows-unittest-matrix (receiver-3)	16m 44s
windows-unittest-matrix (processor-0)	7m 34s
windows-unittest-matrix (processor-1)	14m 16s
windows-unittest-matrix (exporter-0)	11m 21s
windows-unittest-matrix (exporter-1)	21m 15s
windows-unittest-matrix (exporter-2)	11m 21s
windows-unittest-matrix (exporter-3)	13m 23s
windows-unittest-matrix (extension)	13m 3s
windows-unittest-matrix (connector)	10m 51s
windows-unittest-matrix (internal)	14m 19s
windows-unittest-matrix (pkg)	8m 40s
windows-unittest-matrix (cmd-0)	3m 16s
windows-unittest-matrix (cmd-1)	11m 46s
windows-unittest-matrix (other)	14m 18s
windows-unittest	3s
	3h 43m 38s

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