feat: add no-show event to Zapier integration [CAL-5107]

[nikhilgupta58]

This PR adds the no-show event to the Zapier integration by:

1. Adding the no-show template to the Zapier interface in AppSettingsInterface.tsx
2. Updating the Zapier documentation in README.md

The changes enable users to create automations in Zapier when bookings are marked as no-show.

Closes #18992
/claim #18992

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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (04/06/25)

1 reviewer was added to this PR based on Keith Williams's automation.

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1 label was added to this PR based on Keith Williams's automation.

[retrogtx]

we will need a before and after for this one @nikhilgupta58