Work Items: Import basic data

Basic fields:

• Title
• Work item type

Author username and ID are used in Requirements export but not import.

• 1️⃣ Logic prep !110724 (merged)
• 2️⃣ Email notification !112003 (merged)
• 3️⃣ Work Item types !112271 (merged)
• 4️⃣ Work item type notification emails !113474 (merged)
• 5️⃣ Endpoint !113484 (merged)

extra:

• Add import work items policy (!114057 - merged)