Remove README and CONTRIBUTING files from release 3rd try (#5226) #932

Job	Run time
Start	8s
Build integration tests	15s
Build Piper	1m 30s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	39s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	36s
Run integration tests ("TestCNBIntegrationNPMProject")	37s
Run integration tests ("TestCNBIntegrationMultiImage")	38s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	38s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	39s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	38s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	37s
Run integration tests ("TestGolangIntegration")	37s
Run integration tests ("TestGradleIntegration")	37s
Run integration tests ("TestMavenIntegration")	36s
Run integration tests ("TestMTAIntegration")	37s
Run integration tests ("TestTmsUploadIntegration")	36s
Run integration tests ("TestTmsExportIntegration")	1s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	24s
Finish	2s
	10m 25s

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