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)

changed milestone to %Next 1-3 releases

added groupfoundations maintenancedependency typemaintenance labels

set weight to 3

assigned to @thutterer

added devopsmanage sectiondev labels

mentioned in merge request !118935 (merged)

mentioned in merge request !119965 (merged)

marked the checklist item Enable opt-in deprecation warnings, !118935 (merged) as completed

mentioned in merge request !119967 (merged)

changed the description

mentioned in merge request !119977 (merged)

marked the checklist item !119965 (merged) as completed

marked the checklist item !119967 (merged) as completed

marked the checklist item !119977 (merged) as completed

mentioned in merge request !120604 (merged)

changed the description

mentioned in merge request !120717 (merged)

marked the checklist item !120717 (merged) as completed

mentioned in merge request !120844 (merged)

changed the description

mentioned in merge request !120719 (merged)

mentioned in merge request !121017 (merged)

changed the description

mentioned in issue #412255 (closed)

marked the checklist item !120719 (merged) as completed

marked the checklist item Update docs: !120844 (merged) as completed

marked the checklist item !121017 (merged) as completed

mentioned in merge request !122201 (merged)

changed the description

mentioned in merge request !120085 (merged)

marked the checklist item Fix deprecation warnings, in batches: as completed

marked the checklist item Raise deprecation warnings about slot setter as error in development and test envs: !120085 (merged) as completed

changed the description

mentioned in merge request !118493 (merged)

marked the checklist item Update dependency view_component to v3 (!118493 - merged) as completed

Final MR !118493 (merged) is merged and we are on view_component v3.1 now

/cc @samdbeckham

closed

added workflowcomplete label

mentioned in issue gitlab-org/manage/foundations/team-tasks#270