Remove README and CONTRIBUTING files from release 2nd try (#5225) #930

Job	Run time
Start	12s
Build integration tests	15s
Build Piper	1m 19s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 27s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	1m 15s
Run integration tests ("TestCNBIntegrationNPMProject")	2m 10s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 23s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 38s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	1m 18s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 15s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	1m 17s
Run integration tests ("TestGolangIntegration")	1m 42s
Run integration tests ("TestGradleIntegration")	1m 17s
Run integration tests ("TestMavenIntegration")	1m 52s
Run integration tests ("TestMTAIntegration")	1m 50s
Run integration tests ("TestTmsUploadIntegration")	55s
Run integration tests ("TestTmsExportIntegration")	58s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 12s
Finish	8s
	24m 23s

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