R1:2f313a0e0d55

Remove "unstable" status and T2784-specific warning message

Summary: Ref T2784. These are lookin' pretty stable. Subclasses like `DiffusionGetLintMessagesConduitAPIMethod` have their warnings about unstable methods, so just remove this warning in the base class.

Test Plan: Loaded `/conduit`, observed lack of unstable warnings. Only unstable methods are now `diffusion.getlintmessages`, `diffusion.looksoon`, and `diffusion.updatecoverage`.

Reviewers: epriestley

Reviewed By: epriestley

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