Add Lint to dissuade users from creating multiple goldens in a single test

[pdblasi-google]

Golden tests can be pretty flaky in and of themselves, and the flow is made worse when users have multiple goldens in a single test. If a user does that, it means that you'd have to make multiple passes through the test to update each golden. It'd be great to have a lint that drives a user to use AnimationSheetBuilder when multiple golden checks are defined in a single test.

[srawlins]

Can you explain what goldens you are referring to? Or what a golden check is? Or how AnimationSheetBuilder would disable a diagnostic from being reported?

In order to implement a linter rule, we'd need very specific notions of what code should trigger a diagnostic. Any details would be appreciated. Thanks!

[github-actions]

Without additional information we're not able to resolve this issue. Feel free to add more info or respond to any questions above and we can reopen the case. Thanks for your contribution!