feat(events): Publish events to GCP PubSub by each step (#5122) #868

Job	Run time
Start	6s
Build Piper	1m 20s
Build integration tests	29s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 38s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	1m 28s
Run integration tests ("TestCNBIntegrationNPMProject")	2m 7s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 43s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 24s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	1m 21s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 22s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	1m 23s
Run integration tests ("TestGolangIntegration")	1m 51s
Run integration tests ("TestGradleIntegration")	1m 48s
Run integration tests ("TestMavenIntegration")	2m 3s
Run integration tests ("TestMTAIntegration")	1m 53s
Run integration tests ("TestTmsUploadIntegration")	59s
Run integration tests ("TestTmsExportIntegration")	53s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 26s
Finish	3s
	26m 17s

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