[pkg/ottl] Add support for non-element nodes in GetXML (#36821) #18168

Job	Run time
arm-unittest-matrix (receiver-0)	5m 32s
arm-unittest-matrix (receiver-1)	7m 58s
arm-unittest-matrix (receiver-2)	8m 28s
arm-unittest-matrix (receiver-3)	6m 37s
arm-unittest-matrix (processor-0)	3m 37s
arm-unittest-matrix (processor-1)	4m 57s
arm-unittest-matrix (exporter-0)	3m 22s
arm-unittest-matrix (exporter-1)	10m 5s
arm-unittest-matrix (exporter-2)	4m 21s
arm-unittest-matrix (exporter-3)	5m 12s
arm-unittest-matrix (extension)	5m 32s
arm-unittest-matrix (connector)	4m 14s
arm-unittest-matrix (internal)	7m 2s
arm-unittest-matrix (pkg)	3m 32s
arm-unittest-matrix (cmd-0)	1m 24s
arm-unittest-matrix (cmd-1)	1m 54s
arm-unittest-matrix (other)	4m 22s
arm-unittest	1s
	1h 28m 10s

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