Update scheduled-events.md

[sanjac0002]

Added an event type - Preempt with minimum notice of 30 seconds to the list.

[prmerger-automator]

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[Court72]

@EricRadzikowskiMSFT

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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[v-dirichards]

@EricRadzikowskiMSFT

Can you review this old PR and determine whether it needs to be closed or merged?

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