[integration] Edit the title of a Task

This is the integration issue for the work-items title widget, including the GraphQL query and any mutations needed. Related to #334808 (closed), which will have the schema mocked. When the schema is determined, move the definition to this issue.

Schema

See https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/assets/javascripts/work_items/graphql/typedefs.graphql#L40 for definition.

Acceptance Criteria

• Title updates in real-time
• Redis counter
• Snowplow event tracker (documentation TBD)
• Existing issues_edit Redis counter is also still fired

Redis Counters

• name: users_updating_work_item_title
• category: work_items
• redis_slot: users
• include in the following aggregation counters:
  • xmau_plan
  • xmau_project_management
  • xmau_product_planning
  • xmau_certify
  • users_work_items
• documentation: Service Ping Implementation, Redis HLL Counters, Plan's Redis HLL Schema / Approach

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