Add Integration Test to cover DmiRestClient Fluent lambda method calls

Add Integration Test to cover DmiRestClient Fluent lambda method calls

- Tests to cover WebClient method calls that cannot be covered in unit test
  .headers(..)
  .OnErrorMap()
- refactored error handling and removed impossible (legacy() exception handling
- refactored 2 data Job specifically (named) methods to single generic data get method
- removed all unit test no longer needed due to integration test for DMI Web Client

Issue-ID: CPS-2702
Change-Id: I431df50189c10f230ed0459a73a98fda17384070
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>