Replace JSON pointer URI fragment with anchor references in JSON schemas

[Whathecode]

The json-schema-validator library we want to use for JSON schema validation does not yet support named anchor lookup for the metaschema we are using (draft 2019/09).

As a workaround, we currently use JSON pointer URIs within our schemas to point to these anchors.

The current locations are:

• TriggeredTask.json to point to TaskControl#Control
• In application service request objects (e.g., DataStreamServiceRequest.json) to point to definitions within the same file
• JsonSchemaTest.kt to load the reponse schemas of requests

Once json-schema-validator provides support for this, we can upgrade and replace these references with named anchor references.

[Whathecode]

This works partially with a bugfix for json-schema-validator introduced in 1.0.67. All external references to anchors now use the anchor notation. However, internal anchor references still fail and currently thus still use the full path notation.