DSND-2703: Fix sonar issues (#115)
* DSND-2703: Upgrade to Java 21
* DSND-2703: Get docker working with cucumber tests
* The cucumber tests would not run due to testcontainers not
finding a "valid docker environment". The reason for this was
because data-sync-api-sdk-java had the transitive dependency
docker-java-api which is out of date (presumeably out of date
with the current spring or testcontainers version. Therefore,
adding the docker-java-api dependency to the pom with the most
recent version got the cucumber tests running, albeit not all
pass.
* In addition to this, I've added docker-java-api as an exclusion
to data-sync-api-sdk-java to be even more explicit - this might
get removed going forward as it may be deemed unneccessary.
* DSND-2703: WIP get cucumber 503s working
* TestRestTemplate was timing out due to waiting for Mongo to respond.
This was caused by an out of date transitive dep.
* DSND-2703: Remove unused dep
* DSND-2703: Remove unused property from pom
* DSND-2703: Clean up pom
* DSND-2703: Fix failing GET list cucumber tests
* DSND-2703: Add autocloseable to steps
* DSND-2703: Optimise imports
* DSND-2703: Address majority of sonar lint complaints
* DSND-2703: Refactor switch statement
* DSND-2703: WIP Trying to fix checkstyle plugin issue
* DSND-2703: Remove checkstyle plugiin
* DSND-2703: Remove unused exception class
* DSND-2703: Remove unused get/set
