[chore][pkg/stanza] Cleanup filter operator files #29708

Job	Run time
collector-build	5m 1s
docker-build	5m 23s
supervisor-test	49s
kubernetes-test-matrix (v1.26.0, receiver/k8sclusterreceiver)	4m 34s
kubernetes-test-matrix (v1.26.0, processor/k8sattributesprocessor)	4m 21s
kubernetes-test-matrix (v1.26.0, receiver/kubeletstatsreceiver)	4m 19s
kubernetes-test-matrix (v1.26.0, receiver/k8sobjectsreceiver)	3m 16s
kubernetes-test-matrix (v1.25.3, receiver/k8sclusterreceiver)	4m 56s
kubernetes-test-matrix (v1.25.3, processor/k8sattributesprocessor)	5m 8s
kubernetes-test-matrix (v1.25.3, receiver/kubeletstatsreceiver)	4m 25s
kubernetes-test-matrix (v1.25.3, receiver/k8sobjectsreceiver)	3m 15s
kubernetes-test-matrix (v1.24.7, receiver/k8sclusterreceiver)	4m 43s
kubernetes-test-matrix (v1.24.7, processor/k8sattributesprocessor)	4m 28s
kubernetes-test-matrix (v1.24.7, receiver/kubeletstatsreceiver)	4m 29s
kubernetes-test-matrix (v1.24.7, receiver/k8sobjectsreceiver)	3m 20s
kubernetes-test-matrix (v1.23.13, receiver/k8sclusterreceiver)	4m 56s
kubernetes-test-matrix (v1.23.13, processor/k8sattributesprocessor)	4m 20s
kubernetes-test-matrix (v1.23.13, receiver/kubeletstatsreceiver)	4m 27s
kubernetes-test-matrix (v1.23.13, receiver/k8sobjectsreceiver)	3m 30s
kubernetes-test	1s
	1h 19m 41s

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