Upgrade to view_component v3.0

The view_component gem released a new major version and we should upgrade to it.

Version 3 removes a couple of long deprecated features so it is a "breaking change" that needs some prep work.

• Upgrade to the latest v2 version, !118857 (merged)
• Enable opt-in deprecation warnings, !118935 (merged)
• Update docs: !120844 (merged)
• Fix deprecation warnings, in batches:
  • !119965 (merged)
  • !119967 (merged)
  • !119977 (merged)
  • !120604 (merged)
  • !120717 (merged)
  • !120719 (merged)
  • !121017 (merged)
  • !122201 (merged)
• Raise deprecation warnings about slot setter as error in development and test envs: !120085 (merged)
• Update dependency view_component to v3 (!118493 - merged) 🎉