Summary

This PR corrects the SDL (Schema Definition Language) output for directives that are marked asrepeatable.

Details

• Ensures that the keywordrepeatable is correctly included in the directive SDL representation whenis_repeatable is set totrue.
• The output now conforms to the GraphQL specification for repeatable directives.

Additions

• Added unit tests to verify correct SDL rendering:
  • ✅test_repeatable_directive_dsl
  • ✅test_non_repeatable_directive_dsl

Motivation

Previously, the SDL output omitted therepeatable keyword even when the directive was defined as repeatable. This led to incorrect or incomplete schema definitions. With this fix, the SDL generation is now accurate and spec-compliant.