fix(core): Scheduler tasks should not trigger on follower instances #10507
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Summary
When n8n is running in multi-main mode, it's possible for a short while for multiple main instances to have active timers for scheduled tasks (until the leadership handover finishes). During this time if a scheduled task is invoked on a non-leader instance, it should simply be ignored.
Related Linear tickets, Github issues, and Community forum posts
https://linear.app/n8n/issue/NODE-1607
Review / Merge checklist
release/backport