Reduce nested-ness of tasks (IOS-192)

Thank you @kimar

Mastodon/Protocol/Provider/DataSourceFacade+Profile.swift

@@ -56,7 +56,6 @@ extension DataSourceFacade {
     ) async {
         provider.coordinator.showLoading()
 
-        Task {
         do {
             guard let account = try await provider.context.apiService.fetchUser(
                 username: username,
@@ -73,7 +72,6 @@ extension DataSourceFacade {
             provider.coordinator.hideLoading()
         }
     }
-    }
 
     @MainActor
     static func coordinateToProfileScene(
@@ -83,7 +81,6 @@ extension DataSourceFacade {
     ) async {
         provider.coordinator.showLoading()
 
-        Task {
             do {
                 let account = try await provider.context.apiService.accountInfo(
                     domain: domain,
@@ -98,7 +95,6 @@ extension DataSourceFacade {
                 provider.coordinator.hideLoading()
         }
     }
-    }
 
     @MainActor
     public static func coordinateToProfileScene(

Mastodon/Scene/Onboarding/Login/MastodonLoginViewController.swift

@@ -142,13 +142,12 @@ class MastodonLoginViewController: UIViewController, NeedsDependency {
 
         authenticationViewModel
             .authenticated.sink { (domain, account) in
-                Task {
+                Task { @MainActor in
                     do {
                         _ = try await self.context.authenticationService.activeMastodonUser(domain: domain, userID: account.id)
                         FileManager.default.store(account: account, forUserID: MastodonUserIdentifier(domain: domain, userID: account.id))
-                        Task { @MainActor in
+
                         self.coordinator.setup()
-                        }
                     } catch {
                         assertionFailure(error.localizedDescription)
                     }