Move integration test (clean-up, last phase)

Move integration test (clean-up, last phase)

- Moved session manager test
- Improved schemaset concurrency test (retry testing)
- Cleaned up all ri (container based) integration test (setup)
- Applied some groovy best practice where needed
- internal ri module cover now down to 29%, covred by integration instead with
  - Line coverage up by 41 lines to 99% (was 97%)
  - Branch coverage up by 3 branches to 96% (was 93%)

Issue-ID: CPS-1687
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
Change-Id: Ifb77a053e5a5db62a3f6a32ae60a3a8b10918efd