Update usages of com.networknt:json-schema-validator to the new API. ( 1.5.9 -> 2.0.1 )

[pedroboado]

Migrate from the removed 1.x API to the 2.x equivalents:

• JsonSchemaFactory → SchemaRegistry (builder pattern)
• JsonSchema → com.networknt.schema.Schema
• SchemaValidatorsConfig → SchemaRegistryConfig
• MapSchemaMapper → MapResourceLoader (now maps IRI to schema content)
• ValidationMessage → Error; Set → List

Update JsonParseTest to reflect that Error.getMessage() no longer prefixes the instance location (e.g. "$: ") to the message text.

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for 7848b121	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7848b12)	Report Missing	Report Missing	Report Missing
Head commit (b72fdc7)	6670	5055	75.79%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#797)	16	16	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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