OLMIS-6761 Upgrade Spring Boot to 2.2.2
- Review regular Spring Boot 2.x changes.
- Removing of migration tests and API key initializer test, since they are not useful now and require more work to maintain.
- Spring Boot 2.x now requires specifying a password encoder, rather than just using the default. Since we don't have an encoder prefix for our passwords, using the NoOpPasswordEncoder. (https://spring.io/blog/2017/11/01/spring-security-5-0-0-rc1-released#password-encoding)
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