Switch spring datasource to flyway in test config

#deploy-levende-arbeidsforhold-ansettelse

Updated the application.yaml to replace the spring datasource configuration with a flyway configuration for the test environment. This change is intended to streamline database migrations during testing.

apps/levende-arbeidsforhold-ansettelse/src/test/resources/application.yaml

@@ -1,6 +1,6 @@
 
 spring:
-  datasource:
+  flyway:
     url: jdbc:h2:mem:testdb
     username: sa
     password: