[IDC-1670] Better display of derived datasets in side panel. (#1962)

* WIP

* WIP

* WIP

* WIP

* Working click on seg.

* Load SEG if not loaded and set active.

* RTSTRUCT

* feat: 🎸 Display SEG and RTSTRUCT in side panel

* Throw error if dataset not available.

* Add delay in microscopy viewer e2e test.

* Add delay in microscopy viewer e2e test.

platform/core/src/classes/metadata/StudyMetadata.js

@@ -139,9 +139,11 @@ export class StudyMetadata extends Metadata {
       if (displaySet) {
         displaySet.sopClassModule = true;
 
-        displaySet.isDerived
-          ? this._addDerivedDisplaySet(displaySet)
-          : displaySets.push(displaySet);
+        if (displaySet.isDerived) {
+          this._addDerivedDisplaySet(displaySet);
+        }
+
+        displaySets.push(displaySet);
 
         return displaySets;
       }