Automatic PR Generation with Blueprints

Requesting Blueprints to have the ability to automatically generate Pull Requests in Github from templates, similar to Backstage Software Templates.

The auto PR generation would allow our users to follow the existing PR workflow for IaC (Terraform, Helm, K8s manifests). The intended workflow is similar to how Blueprints currently work, where users input values into a form, but instead of a stack being generated, Blueprints would automatically generate a pull request to the Git repository specified in the template, allowing users to add resources to existing stacks.