Summary

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

Details

• Ensures that the keyword repeatable is correctly included in the directive SDL representation when is_repeatable is set to true.
• 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 the repeatable 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.