Stop dumping every Dag to stdout when syncing FAB permissions - #70939

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.

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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