fix: 🐛 Fix RT Panel hide/show and Fix looping load errors (#1877)

* fix: 🐛 Fix RT Panel hide/show

* Prevent infinite loop by persisting load errors on displaySet.

* fix: 🐛 Fix infinite error messages

* Fix unit tests.

* comment out reamining MRSTUDY line

extensions/dicom-segmentation/src/loadSegmentation.js

@@ -41,6 +41,7 @@ export default async function loadSegmentation(
       results = _parseSeg(segArrayBuffer, imageIds);
     } catch (error) {
       segDisplaySet.isLoaded = false;
+      segDisplaySet.loadError = true;
       reject(error);
     }