Add a new event update_started in pulumi cloud webhook

[raymzag]

Hello!

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Issue details

I can see that there's already update_succeeded and updated_failed in the available events here https://www.pulumi.com/docs/pulumi-cloud/webhooks/#event-filtering. I would like to subscribe to when update was kicked off. Why? I want to know for sure that update has been kicked off, I can easily see how long it takes in my slack channel etc.

I would be happy to work on it.

Affected area/feature

Pulumi Service