fix: resolve integration test infrastructure issues

[agrasth]

• All tests passed. If this feature is not already covered by the tests, I added new tests.

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Title: Fix MockServer integration test failures caused by Jackson version conflict

Description:

Problem:

After the security upgrades in PR #112, integration tests started failing with:

IllegalArgumentException: exception while parsing [...] for Expectation

Root Cause:
The dependencyManagement section was forcing Jackson 2.18.2 on all dependencies, including MockServer's transitive dependencies. MockServer 5.14.0/5.15.0 is incompatible with Jackson 2.18.2, causing JSON parsing failures.
Solution:

• Removed jackson-databind and jackson-core from to prevent version forcing on test dependencies
• Added Jackson 2.18.2 as explicit compile-scope dependencies to maintain security fixes for production code
• Reverted MockServer to 5.14.0 and removed the unnecessary jackson-databind exclusion