Add "disabled" property to deployments

[dylanbhughes]

First check

• [X] I added a descriptive title to this issue.
• [X] I used the GitHub search to find a similar request and didn't find it.
• [X] I searched the Prefect documentation for this feature.

Prefect Version

3.x

Describe the current behavior

Currently deployments have paused but this impacts only schedules and their associated flow runs.,

Describe the proposed behavior

Add disabled property to deployment which disables all flow run creation mechanisms for that deployment.

• [x] disabled property on Deployment
• [x] New API routes for /disable and /enable
• [x] Calling create_flow_run for a disabled deployment returns an error
• [x] Automation triggers that would create flow runs for the deployment instead do nothing
• [x] When /disable is called, we delete the scheduled runs for the deployment
• [x] The scheduling mechanism does not schedule new runs for disabled deployments
• [x] ~Editing schedules for a disabled deployment returns an error~ Decided against implementing
• [x] Can't pause/unpause a disabled deployment

Example Use

No response

Additional context

For the Prefect team: https://www.notion.so/prefect/Enabling-Disabling-Deployments-9c482ed8fedb434cba8043a44e106069

[MaleicAcid]

really need this