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/sqlstore.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/grafana/dskit/concurrency"
+
 	"github.com/grafana/grafana/pkg/infra/db"
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
@@ -325,3 +326,28 @@ func (ss *sqlStore) GetHeight(ctx context.Context, foldrUID string, orgID int64,
 	}
 	return height, nil
 }
+
+func (ss *sqlStore) GetFolders(ctx context.Context, orgID int64, uids []string) ([]*folder.Folder, error) {
+	if len(uids) == 0 {
+		return []*folder.Folder{}, nil
+	}
+	var folders []*folder.Folder
+	if err := ss.db.WithDbSession(ctx, func(sess *db.Session) error {
+		b := strings.Builder{}
+		b.WriteString(`SELECT * FROM folder WHERE org_id=? AND uid IN (?` + strings.Repeat(", ?", len(uids)-1) + `)`)
+		args := []any{orgID}
+		for _, uid := range uids {
+			args = append(args, uid)
+		}
+		return sess.SQL(b.String(), args...).Find(&folders)
+	}); err != nil {
+		return nil, err
+	}
+
+	// Add URLs
+	for i, f := range folders {
+		folders[i] = f.WithURL()
+	}
+
+	return folders, nil
+}