New incident automations docs

[estherk15]

What does this PR do? What is the motivation?

New docs for Incident Automations
DOCS-12924

Merge instructions

Merge readiness:

• Ready to merge

[github-actions]

Preview links (active after the build_preview check completes)

New or renamed files

• https://docs-staging.datadoghq.com/esther/docs-12924-incident-automations/incident_response/incident_management/incident_settings/automations

Modified Files

• https://docs-staging.datadoghq.com/esther/docs-12924-incident-automations/incident_response/incident_management/incident_settings/

[maycmlee]

Created docs card for review: https://datadoghq.atlassian.net/browse/DOCS-13037

[mg-dd]

Thanks so much for putting this together so quickly! Here are a few things I noticed:

Automatically trigger actions based on incident events such as severity changes, role assignments, state transitions, or postmortem generation.

Some of these are features coming down the pipe but aren't currently available, specifically role assignment changes and postmortem generation. Of the two, postmortem generation is most close to being ready.

Be aware that execution history (including private incident data) is visible to anyone in your organization. To run automations on private incidents securely:

Maybe mention anyone in the org can view "by default"? We should be rolling out the ability to restrict view access tomorrow, so thank you for including this 🤞

Use cases and examples

We can link to real blueprints if that's helpful. I'm not sure if it's feasible to link from the docs page into customer orgs.