[extension/observer/k8sobserver] add k8s.ingress endpoint (#33005) #40

Job	Run time
windows-unittest-matrix (receiver-0)	16m 27s
windows-unittest-matrix (receiver-1)	19m 42s
windows-unittest-matrix (receiver-2)	18m 30s
windows-unittest-matrix (receiver-3)	18m 32s
windows-unittest-matrix (processor-0)	7m 32s
windows-unittest-matrix (processor-1)	11m 39s
windows-unittest-matrix (exporter-0)	10m 1s
windows-unittest-matrix (exporter-1)	17m 27s
windows-unittest-matrix (exporter-2)	11m 24s
windows-unittest-matrix (exporter-3)	16m 21s
windows-unittest-matrix (extension)	14m 20s
windows-unittest-matrix (connector)	13m 8s
windows-unittest-matrix (internal)	14m 30s
windows-unittest-matrix (pkg)	10m 6s
windows-unittest-matrix (cmd-0)	2m 59s
windows-unittest-matrix (cmd-1)	9m 23s
windows-unittest-matrix (other)	16m 26s
windows-unittest	0s
	3h 48m 27s

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