[MMGIS] Modify Independent time contexts, open in new tab action, and expose overlay plots to support MMGIS pivoting (#6025)

* Expose overlay plot so that it can be imported by an external plugin

* If the current object has an independentContext, ignore any upstream independentContext

* Accept any custom url param in open in new tab action

src/plugins/plot/MctPlot.vue

@@ -383,10 +383,8 @@ export default {
         },
         setTimeContext() {
             this.stopFollowingTimeContext();
-
             this.timeContext = this.openmct.time.getContextForView(this.path);
             this.followTimeContext();
-
         },
         followTimeContext() {
             this.updateDisplayBounds(this.timeContext.bounds());