[migration] serve-stable-diffusion-v2 -> new template publishing pipeline

[elliot-barn]

migrating serve-stable-diffusion-v2 to use new template publishing workflow

Details taken from product: https://github.com/anyscale/product/blob/master/backend/workspace-templates.yaml#L509

Testing in the dev environment:

[aslonnie]

have you tried running this on staging?

[gitar-bot]

Code Review ✅ Approved

Clean configuration addition that follows existing patterns in BUILD.yaml. No issues found.

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