This will reduce the starlark code size in flutter/infra and make it easier for developers to add new builders to Flutter infrastructure.

• Builder to auto-roll changes - https://flutter-review.googlesource.com/c/recipes/+/15902
• Cocoon - https://github.com/flutter/infra/pull/476
• Engine - https://flutter-review.googlesource.com/c/infra/+/15660
• Framework - https://flutter-review.googlesource.com/c/infra/+/16661
• Packages - https://flutter-review.googlesource.com/c/infra/+/16602
• Plugins - https://flutter-review.googlesource.com/c/infra/+/16742

Related issues

• tests that change shard name also change builder name, break release branch config #82210 - Sharded tests break on releases
• Missing test to validate prod builder configuration before enabling in prod_builders.json #79399 - Ensure builds exist in LUCI config before adding to .ci.yaml
• [infra] No way to skip builders per-branch on post-submit #64975