QA - add to feature signoff checklist

[TKDickson]

• [x] Expand the feature signoff checklist so it's really more of a useful/explicit checklist.
• [x] Can include links to STCs if they exist.
• [x] Consider adding a number of things that used to live on the epic checklists

[TKDickson]

Included every time (always)

• ACs met
• API error handling
• Availability Framework
• Maintenance windows/downtime
• Accessibility testing to a11y annotation
• Feature testing summary completed
• Demo mode
• Detox
• Test plan was peer reviewed
• Prioritization of bug tickets caused by development

Considered every time (may or may not be included)

• Analytics
• Feature flags (for slow rollout, or offswitch)
• Update in-app review code
• Website comparison
• Old client & new API
• New client & old API
• UXQA - Visual/interaction
• UXQA - Content
• UXQA - Accessibility
• Ready for UAT/user testing

Post-develop merge:

• Test cases added to RC script