Remove unused imports and declarations.

Author: CalebRas

Shared/Samples/Control annotation sublayer visibility/ControlAnnotationSublayerVisibilityView.Model.swift

@@ -13,7 +13,7 @@
 // limitations under the License.
 
 import ArcGIS
-import SwiftUI
+import Foundation
 
 extension ControlAnnotationSublayerVisibilityView {
     /// The view model for this sample.

Shared/Samples/Generate geodatabase replica from feature service/GenerateGeodatabaseReplicaFromFeatureServiceView.Model.swift

@@ -13,7 +13,7 @@
 // limitations under the License.
 
 import ArcGIS
-import SwiftUI
+import Foundation
 
 extension GenerateGeodatabaseReplicaFromFeatureServiceView {
     /// The view model for the sample.

Shared/Samples/Snap geometry edits with utility network rules/SnapGeometryEditsWithUtilityNetworkRulesView.Model.swift

@@ -262,7 +262,6 @@ extension SubtypeSublayer: Renderable {}
 
 private extension String {
     static let distributionPipe = "Distribution Pipe"
-    static let excessFlowValve = "Excess Flow Valve"
     static let graphics = "Graphics"
     static let pipelineLine = "PipelineLine"
     static let servicePipe = "Service Pipe"