[Task] Remove gson in favour of jackson

[andrewazores]

Some code carried forward from the old repository included gson as a dependency. Elsewhere we also have a dependency on Jackson via Quarkus, and more recently via projectnessie CEL as well. Gson should be dropped and all usages converted to use Jackson instead.

[andrewazores]

Upon review, Gson only actually gets pulled in for one usage in an integration test util in JvmIdWebRequest, which currently is only called from the disabled custom targets integration test. Should be very easy to replace but will be difficult to validate that the replacement is functioning correctly without a working test case.

The pom.xml already scopes the dependency for test only so this would not affect actual container distributions.

[lkonno]

@andrewazores The JvmIdWebRequest uses the graphql to query the jvmId of the targetId, so it seems that it will depend on the graphql endpoint implementation to re-enable this test.

[andrewazores]

Thanks for checking on that @lkonno