Folders: Able to fetch folders available for user as "shared" folder (#77774)

* Folders: Show folders user has access to at the root level

* Refactor

* Refactor

* Hide parent folders user has no access to

* Skip expensive computation if possible

* Fix tests

* Fix potential nil access

* Fix duplicated folders

* Fix linter error

* Fix querying folders if no managed permissions set

* Update benchmark

* Add special shared with me folder and fetch available non-root folders on demand

* Fix parents query

* Improve db query for folders

* Reset benchmark changes

* Fix permissions for shared with me folder

* Simplify dedup

* Add option to include shared folder permission to user's permissions

* Fix nil UID

* Remove duplicated folders from shared list

* Only left the base part

* Apply suggestions from code review

Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

* Add tests

* Fix linter errors

---------

Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

pkg/services/folder/folderimpl/store.go

@@ -33,4 +33,7 @@ type store interface {
 	// GetHeight returns the height of the folder tree. When parentUID is set, the function would
 	// verify in the meanwhile that parentUID is not present in the subtree of the folder with the given UID.
 	GetHeight(ctx context.Context, foldrUID string, orgID int64, parentUID *string) (int, error)
+
+	// GetFolders returns folders with given uids
+	GetFolders(ctx context.Context, orgID int64, uids []string) ([]*folder.Folder, error)
 }