DGS-18989 Allow empty fragment (#) in $schema prop for JSON Schema

[rayokota]

Allow empty fragment (#) in $schema prop for JSON Schema, e.g.

http://json-schema.org/draft-07/schema#

vs

http://json-schema.org/draft-07/schema

[confluent-cla-assistant]

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Analysis Details

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Coverage and Duplications

• No coverage information (0.00% Estimated after merge)
• No duplication information (6.80% Estimated after merge)

Project ID: schema-registry

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