Create templates for release messaging: updates and breaking changes

[SmartMouthWords]

As a GC Design System team member, I need a more efficient way to send release messages that are clear and consistent.
Templates to include:

• A content structure for main types of messaging
• Options to choose from reusable text
• Basic guidelines for release communications

[SmartMouthWords]

Started an outline for a release message using the React with SSR canary release as a model (second part of document): https://docs.google.com/document/d/19DVkjZrTg-qoBEgaw-u1woi_mlPQZK1TrCWsfj4pWNU/edit#heading=h.s3vz6ryynczy