feat: Move multitenancy code to the webapp-tenants #860

Job	Run time
build (18)	1m 30s
build (20)	1m 28s
test (18)	2m 32s
test (20)	2m 12s
test-lib (18, webapp-core)	2m 57s
test-lib (18, webapp-api-client)	2m 50s
test-lib (18, webapp-contentful)	2m 20s
test-lib (18, webapp-crud-demo)	2m 29s
test-lib (18, webapp-documents)	2m 16s
test-lib (18, webapp-notifications)	2m 4s
test-lib (18, webapp-emails)	2m 12s
test-lib (18, webapp-finances)	2m 33s
test-lib (18, webapp-generative-ai)	2m 11s
test-lib (18, webapp-tenants)	1m 8s
test-lib (20, webapp-core)	2m 31s
test-lib (20, webapp-api-client)	2m 3s
test-lib (20, webapp-contentful)	2m 2s
test-lib (20, webapp-crud-demo)	1m 58s
test-lib (20, webapp-documents)	1m 49s
test-lib (20, webapp-notifications)	2m 4s
test-lib (20, webapp-emails)	1m 53s
test-lib (20, webapp-finances)	2m 5s
test-lib (20, webapp-generative-ai)	1m 58s
test-lib (20, webapp-tenants)	58s
	50m 3s

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