Deprecate search APIs

Summary

Tag search APIs as deprecated, planned to be fully removed next release (M23)

Type of change

• 📃 Documentation
• ❗ Deprecation

Validation

• New tests added
• Covered by the unit tests
• Covered by the integration tests
• Non functional testing (performance, scalability, security ...)
• Manual testing, description: checking open api spec/swagger ui

Work Item

• Work item link provided: issue #83 (closed)