Simplify Code around building DMI URLs

Simplify Code around building DMI URLs

- Bug analysis showed some unclear and complicated code for building URLs
- This patch is to clean up the related code and show more clearly what is encoded and what is not
- Use SPringBoot provided builder to apply correct encoding of all URI parts
- DmiOperations base class no longer need as no common code model and data operations anymore
- Converted builder to POJO (client needs to provide the only dmi properties upon build)
- Added some missing test (in affected code) to increase coverage percntage
(as the production code has significantly reduced in size the overal coverage was inadvertently reduced below the treshold)
- Added more unit test. Now impl.operations' package has 100%
- removed the test fro Dmi Exception that was incorrectly callign the handleException methdod directly instead of mocking an exception
it was really a dupclicate of a test I added but I was able to re-use the event checkign in my test

Issue-ID: CPS-2246
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
Change-Id: I1ff196cd03bbb95f5877ee590c321febeb672800