[INTERNAL][FIX] sap.ui.rta: Page variant is not properly applied

- Fixes issue with variant changes being deleted from the change persistence when navigating to a different page
- in this scenario now changes are only removed from the variant and dependency map not from the change persistence

SNOW: DINC0239989
Change-Id: I7b9e96186f89119d3ba27e598feadcf0703b6bf2

src/sap.ui.fl/src/sap/ui/fl/variants/VariantModel.js

@@ -1560,8 +1560,10 @@ sap.ui.define([
 			return mCurrentVariant.controlChanges;
 		})
 		.flat();
+		const oLiveDependencyMap = FlexObjectState.getLiveDependencyMap(this.sFlexReference);
 		aVariantDependentControlChanges.forEach((oChange) => {
-			this.oChangePersistence.removeChange(oChange);
+			DependencyHandler.removeChangeFromMap(oLiveDependencyMap, oChange.getId());
+			DependencyHandler.removeChangeFromDependencies(oLiveDependencyMap, oChange.getId());
 		});
 
 		this.oDataSelector.removeUpdateListener(this.fnUpdateListener);

src/sap.ui.fl/test/sap/ui/fl/qunit/variants/VariantModel.qunit.js

@@ -2433,9 +2433,10 @@ sap.ui.define([
 			});
 			FlexObjectManager.addDirtyFlexObjects(this.oModel.sFlexReference, [oUIChange]);
 			this.oModel.destroy();
+			const oFlexObjects = FlexState.getFlexObjectsDataSelector().get({ reference: sReference });
+			assert.strictEqual(oFlexObjects[0].getId(), "newUIChange", "then the change was not removed from the flex state");
 			assert.strictEqual(oAddRuntimeOnlySpy.callCount, 1, "then the fake Standard variant is added to the runtimeOnlyData");
 
-			stubFlexObjectsSelector([oUIChange]);
 			this.oModel = new VariantModel({}, {
 				flexController: this.oFlexController,
 				appComponent: this.oComponent