Stop dumping every Dag to stdout when syncing FAB permissions

[Eason09053360]

Left over from debugging; the sync_perm command already reports what it is doing, so this only adds one line of raw repr per Dag on top of it.

create_dag_specific_permissions printed every Dag's repr to stdout. It was added
in #53918, a refactor that had no reason to introduce output, and it is the only
bare print in the FAB provider outside cli_commands/ — every other one carries
a human-readable message.

The sync_perm command already prints "Updating permission on all DAG views"
before calling into this method, so the repr line is pure noise on top of it.

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Was generative AI tooling used to co-author this PR?

• Yes — Claude Code (Opus 5)

Generated-by: Claude Code (Opus 5) following the guidelines

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[henry3260]

Good catch!