* Adding member types sibling endpoints
* Introducing sibling endpoint for Partial Views and logic.
* Introducing sibling endpoint for stylesheets
* Introducing sibling endpoint for scripts
* Introducing FileSystemTreeServiceBase.cs
* Introducing interfaces for implementation specific services
* Introducing services for specific trees
* Modifying controller bases to fit new interface and logic.
* Obsoleting old constructors related to PartialView
* Obsoleting ctors related to Stylesheets
* Obsoleting ctors related to scripts
* Adding tests for scriptsTreeService
* Adding tests for siblings
* Removing unused dependencies
* Removing signs and replacing it with flags
* Fixing breaking changes by obsoletion
* Fixing more breaking changes
* Registering missing service
* Fixing breaking changes again
* Changing name of method GetSiblingsViewModels
* Rewritten tests for less bloat and less duplicate code
* Expanding tests to include other methods from service
* Test refactoring: avoided populating file systems that weren't under test, updated encapsulation, renaming, further re-use.
* Management API: Expanding the existing sibling endpoints to support trashed entities (#20154)
* Refactoring existing logic to include trashed items
* Including tests for trashed entities
* Groundwork for trashed siblings
* Documents trashed siblings endpoint
* Controller for Media trashed items
* Expanding tests to include a test for trashed siblings
* Code review corrections
* Resolving code review
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Co-authored-by: Andy Butland <abutland73@gmail.com>
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