Rapid roll-back to previous build

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**Tell us about your request**
What do you want us to build?
Disclaimer: this is not the built-in rollback ability of the blue/green deployment.
When using the build from code method, save the previous deployment to allow us to rollback to it. This could be a "Roll back" button next to the "Deploy" button in the console. If a deployment is pushed that passes the health check, but has breaking business logic changes, it would be wonderful to rapidly roll back to the prior deployment rather than waiting at least 5 minutes to merge, build, and health check the next image.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.
The alternative to recover from the scenario provided is to wait at least 5 minutes to build and health check a new image.

**Additional context**
Anything else we should know?
Mainly relevant for the build from code deployment method.

**Attachments**
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Start by reviewing the App Runner console entry points for the build from code deployment method and how previous deployments are represented. Compare those with the existing blue/green rollback ability, which this request explicitly excludes. Done would mean a user can rapidly select and roll back to the previous deployment after a later build passes health checks.

Written by the indexing model from the issue text.