!refactor(backend): remove legacy user endpoints (#11985)

* realign user API endpoints (#11963)

* realign user API endpoints to make it clearer which one are only applicable to the current user

* fix name

* bump api

* fix test

* fix reference

* fix test exception

* update ref

* reduce breakage

* re-add legacy urls till next `breaking`

(cherry picked from commit 9908870a81)

* remove fallback

* fix style

* fix style

* fix performance test

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [#11111](https://github.com/inventree/InvenTree/pull/11111) - removes legacy metadata APIs
 - [#9814](https://github.com/inventree/InvenTree/pull/9814) - removes legacy config path support
 - [#11667](https://github.com/inventree/InvenTree/pull/11667) - removes legacy url patterns
+- [#11985](https://github.com/inventree/InvenTree/pull/11985) - removes legacy user endpoint fallback
 
 
 ## Unreleased - YYYY-MM-DD