incremental upgrades: complete phase two

Feature Branch: feature/incremental-upgrades

Parent Task: #5919 (closed)

Subtasks

• #5602 (closed)
• #5834 (closed)
• #6062 (closed)
• #6114 (closed)
• #6445 (closed)
• #6446 (closed)
• #6447 (closed)

Related issues

• Blocked by #5922 (closed)
• Blocks #6014 (closed)

Original created by @tails on 5490 (Redmine)