Fix: validate app name (#5155) #886

Job	Run time
Start	10s
Build Piper	1m 21s
Build integration tests	22s
Run integration tests ("(TestCNBIntegrationBindings\|TestCNBIntegrationWrongBuilderProject\|TestCNB...	1m 37s
Run integration tests ("TestCNBIntegrationPreserveFiles\b")	2m 0s
Run integration tests ("TestCNBIntegrationNPMProject")	2m 23s
Run integration tests ("TestCNBIntegrationMultiImage")	2m 38s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksBuildpacklessProject")	1m 29s
Run integration tests ("TestCNBIntegrationNPMCustomBuildpacksFullProject")	2m 2s
Run integration tests ("TestCNBIntegrationProjectDescriptor")	1m 44s
Run integration tests ("TestCNBIntegrationPrePostBuildpacks")	1m 24s
Run integration tests ("TestGolangIntegration")	1m 49s
Run integration tests ("TestGradleIntegration")	1m 42s
Run integration tests ("TestMavenIntegration")	1m 47s
Run integration tests ("TestMTAIntegration")	1m 56s
Run integration tests ("TestTmsUploadIntegration")	57s
Run integration tests ("TestTmsExportIntegration")	51s
Run integration tests ("Test(Gauge\|GCS\|GitHub\|GitOps\|Influx\|NPM\|Piper\|Python\|Sonar\|Vault\|Karma)In...	1m 18s
Finish	3s
	27m 33s

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