Fix driver notifications and remove RHEL 8 builder #5896

Job	Run time
init / common-variables	1m 52s
init / downstream-check	0s
build-builder-image / Determine if builder image needs to be built	5s
build-test-containers / common-variables	4s
build-test-containers / Build the integration test image	2m 10s
build-test-containers / rebuild-containers	0s
build-builder-image / Build the builder image	0s
build-builder-image / Retag x86 builder image	0s
build-builder-image / Create Multiarch manifest	0s
memory-checked-unit-tests (-DADDRESS_SANITIZER=ON)	9m 1s
memory-checked-unit-tests (-DUSE_VALGRIND=ON)	7m 44s
build-collector / Build Collector (amd64)	5m 40s
build-collector / Build Collector (ppc64le)	53s
build-collector / Build Collector (arm64)	54s
build-collector / Build Collector on a remote VM	0s
build-collector / Retag x86 slim image	18s
build-collector / Create Multiarch manifest	0s
benchmarks	0s
integration-tests / amd64-all-integration-tests	0s
integration-tests / arm64-integration-tests	0s
integration-tests / s390x-integration-tests	0s
k8s-integration-tests / Run k8s integration tests	2m 5s
integration-tests / ppc64le-integration-tests	0s
integration-tests / amd64-required-integration-tests (rhel) / Testing rhel	35m 12s
integration-tests / amd64-required-integration-tests (ubuntu-os) / Testing ubuntu-os	23m 59s
k8s-integration-tests / notify	0s
integration-tests / notify	0s
	1h 29m 57s

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