Make NCMP integration tests use MockWebServer

Change from using MockRestServiceServer - which is only compatible
with RestTemplate - to MockWebServer, which will allow tests to work
using WebClient instead of RestTemplate.

Issue-ID: CPS-2183
Change-Id: I7494fe17cba6e92f7df81f0fd0185e1d2b5a5541
Signed-off-by: sourabh_sourabh <sourabh.sourabh@est.tech>
15 files changed