Replace kong.unirest JSONObject with Jackson in ZosmfStatus

[Ashish-Kumar-Dash]

ZosmfStatus was the last file in src/main still parsing JSON with kong.unirest.core.json.JSONObject; every other class in the SDK goes through JsonUtils (Jackson). This brings it in line and removes that last non-Jackson JSON code path.

Changes

• Replaced the JSONObject/optJSONArray plugins-array parsing with JsonUtils.parse + JsonUtils.getArrayByField, the same pattern used in WorkflowList.getWorkflowsCommon.
• Replaced the IntStream.range indexing with a plain for-each loop over the ArrayNode.
• Preserved existing behavior exactly: a missing plugins field, a null value, and an empty array all still resolve to a zero-length ZosmfPlugin[] (verified via root.path(...).isArray() guard, which is false for both MissingNode and NullNode).

[frankgiordano]

Good catch. This makes the code more readable.