Update HeroImage to match the BigIcon component from Compound. (#3439)

We can move it across in a following PR.

ElementX/Sources/Screens/Onboarding/AnalyticsPromptScreen/View/AnalyticsPromptScreen.swift

@@ -35,7 +35,7 @@ struct AnalyticsPromptScreen: View {
     
     private var header: some View {
         VStack(spacing: 8) {
-            HeroImage(icon: \.chart)
+            BigIcon(icon: \.chart)
                 .padding(.bottom, 8)
             
             Text(L10n.screenAnalyticsPromptTitle(InfoPlistReader.main.bundleDisplayName))

ElementX/Sources/Screens/Onboarding/IdentityConfirmationScreen/View/IdentityConfirmationScreen.swift

@@ -37,7 +37,7 @@ struct IdentityConfirmationScreen: View {
     @ViewBuilder
     private var screenHeader: some View {
         VStack(spacing: 0) {
-            HeroImage(icon: \.lockSolid)
+            BigIcon(icon: \.lockSolid)
                 .padding(.bottom, 16)
             
             Text(L10n.screenIdentityConfirmationTitle)

ElementX/Sources/Screens/Onboarding/IdentityConfirmedScreen/View/IdentityConfirmedScreen.swift

@@ -29,7 +29,7 @@ struct IdentityConfirmedScreen: View {
     @ViewBuilder
     private var screenHeader: some View {
         VStack(spacing: 0) {
-            HeroImage(icon: \.checkCircle, style: .success)
+            BigIcon(icon: \.checkCircle, style: .successSolid)
                 .padding(.bottom, 16)
             
             Text(L10n.screenIdentityConfirmedTitle)

ElementX/Sources/Screens/Onboarding/NotificationPermissionsScreen/View/NotificationPermissionsScreen.swift

@@ -27,7 +27,7 @@ struct NotificationPermissionsScreen: View {
     /// The main content of the screen that is shown inside the scroll view.
     private var mainContent: some View {
         VStack(spacing: 8) {
-            HeroImage(icon: \.notificationsSolid)
+            BigIcon(icon: \.notificationsSolid)
                 .padding(.bottom, 8)
             
             Text(L10n.screenNotificationOptinTitle)

ElementX/Sources/Screens/Onboarding/SessionVerificationScreen/View/SessionVerificationScreen.swift

@@ -58,11 +58,11 @@ struct SessionVerificationScreen: View {
     private var screenHeader: some View {
         VStack(spacing: 0) {
             if context.viewState.verificationState == .initial {
-                HeroImage(icon: \.lockSolid)
+                BigIcon(icon: \.lockSolid)
                     .padding(.bottom, 16)
             } else {
                 Image(systemName: headerImageName)
-                    .heroImage()
+                    .bigIcon()
                     .padding(.bottom, 16)
             }