fix: Hanging protocol state fixes (#3242)

* fix: Some residual issues with hanging protocol after state sync

fix: Some issues introduced by the state syncing changes

* fix: PR fixes, mostly code cleanup

* Improve a race condition in an automated test

* Remove obsolete code

* PR fixes

extensions/test-extension/src/hp/hpMN.ts

@@ -186,7 +186,6 @@ const hpMN: Types.HangingProtocol.Protocol = {
         },
       },
       viewportStructure: {
-        layoutType: 'grid',
         layoutType: 'grid',
         properties: {
           rows: 1,
@@ -245,7 +244,6 @@ const hpMN: Types.HangingProtocol.Protocol = {
           },
           displaySets: [
             {
-              matchedDisplaySetsIndex: 1,
               id: 'defaultDisplaySetId',
             },
           ],