refactor: align presentSignupEpilogue behavior

Since the Jetpack app allows site creation, we don’t need to override presentSignupEpilogue anymore.

Author: Momo Ozawa

WordPress/Classes/Utility/App Configuration/AuthenticationHandler.swift

@@ -2,14 +2,6 @@ import WordPressAuthenticator
 
 protocol AuthenticationHandler {
 
-    /// Whether or not the AuthenticationHandler will override or handle the `presentSignupEpilogue` method.
-    /// If this returns true, the `AuthenticationHandler.presentSignupEpilogue` method is called
-    /// If not, then the default implementation will be called instead
-    /// - Returns: Bool, true if we should override the functionality, false if we should not
-    func willHandlePresentSignupEpilogue(in navigationController: UINavigationController, for credentials: AuthenticatorCredentials, service: SocialService?) -> Bool
-
-    func presentSignupEpilogue(in navigationController: UINavigationController, for credentials: AuthenticatorCredentials, service: SocialService?)
-
     // WPAuthenticator style overrides
     var statusBarStyle: UIStatusBarStyle { get }
     var prologueViewController: UIViewController? { get }

WordPress/Classes/ViewRelated/NUX/WordPressAuthenticationManager.swift

@@ -383,11 +383,6 @@ extension WordPressAuthenticationManager: WordPressAuthenticatorDelegate {
     /// Presents the Signup Epilogue, in the specified NavigationController.
     ///
     func presentSignupEpilogue(in navigationController: UINavigationController, for credentials: AuthenticatorCredentials, service: SocialService?) {
-        if let authenticationHandler = authenticationHandler,
-           authenticationHandler.willHandlePresentSignupEpilogue(in: navigationController, for: credentials, service: service) {
-            authenticationHandler.presentSignupEpilogue(in: navigationController, for: credentials, service: service)
-            return
-        }
 
         let storyboard = UIStoryboard(name: "SignupEpilogue", bundle: .main)
         guard let epilogueViewController = storyboard.instantiateInitialViewController() as? SignupEpilogueViewController else {

WordPress/Jetpack/Classes/JetpackAuthenticationManager.swift

@@ -9,23 +9,6 @@ struct JetpackAuthenticationManager: AuthenticationHandler {
     var prologuePrimaryButtonStyle: NUXButtonStyle? = JetpackPrologueStyleGuide.continueButtonStyle
     var prologueSecondaryButtonStyle: NUXButtonStyle? = JetpackPrologueStyleGuide.siteAddressButtonStyle
 
-    func willHandlePresentSignupEpilogue(in navigationController: UINavigationController, for credentials: AuthenticatorCredentials, service: SocialService?) -> Bool {
-        // Don't display the "no sites" epilogue if we allow site creation
-        return !AppConfiguration.allowSiteCreation
-    }
-
-    // If the user signs up using the Jetpack app (through SIWA, for example)
-    // We show right away the screen explaining that they do not have Jetpack sites
-    func presentSignupEpilogue(in navigationController: UINavigationController, for credentials: AuthenticatorCredentials, service: SocialService?) {
-        let windowManager = WordPressAppDelegate.shared?.windowManager
-
-        windowManager?.dismissFullscreenSignIn()
-
-        let viewModel = JetpackNoSitesErrorViewModel()
-        let controller = errorViewController(with: viewModel)
-        windowManager?.show(controller, completion: nil)
-    }
-
     // MARK: - Private: Helpers
     private func isValidJetpack(for site: WordPressComSiteInfo) -> Bool {
         return site.hasJetpack &&