Align accessibility IDs with elementX android (#567)

* Rename onboarding and login user/pass accessibility ids.

* Refactor remaining server change accessibility IDs

* Avoid accessibilityIdentifier spreading to all decorations on the textBox.

Required because otherwise there are multiple items tagged with the accessibilityId
which means we can't click on "the" item.

* Move all accessibility identifiers to `AccessibilityIdentifiers.swft`
- use same naming convention on all of them
- remove the unused ones
- fix build errors in integration tests and invalid identifiers (still broken until autodiscovery lands on rosa)

---------

Co-authored-by: Stefan Ceriu <stefanc@matrix.org>

ElementX/Sources/Screens/Authentication/LoginScreen/View/LoginScreen.swift

@@ -77,23 +77,21 @@ struct LoginScreen: View {
             
             TextField(ElementL10n.loginSigninUsernameHint, text: $context.username)
                 .focused($isUsernameFocused)
-                .textFieldStyle(.elementInput())
+                .textFieldStyle(.elementInput(accessibilityIdentifier: A11yIdentifiers.loginScreen.emailUsername))
                 .disableAutocorrection(true)
                 .textContentType(.username)
                 .autocapitalization(.none)
                 .submitLabel(.next)
                 .onChange(of: isUsernameFocused, perform: usernameFocusChanged)
                 .onSubmit { isPasswordFocused = true }
-                .accessibilityIdentifier("usernameTextField")
                 .padding(.bottom, 20)
             
             SecureField(ElementL10n.loginSignupPasswordHint, text: $context.password)
                 .focused($isPasswordFocused)
-                .textFieldStyle(.elementInput())
+                .textFieldStyle(.elementInput(accessibilityIdentifier: A11yIdentifiers.loginScreen.password))
                 .textContentType(.password)
                 .submitLabel(.done)
                 .onSubmit(submit)
-                .accessibilityIdentifier("passwordTextField")
             
             Spacer().frame(height: 32)
 
@@ -102,7 +100,7 @@ struct LoginScreen: View {
             }
             .buttonStyle(.elementAction(.xLarge))
             .disabled(!context.viewState.canSubmit)
-            .accessibilityIdentifier("nextButton")
+            .accessibilityIdentifier(A11yIdentifiers.loginScreen.continue)
         }
     }
 
@@ -112,7 +110,7 @@ struct LoginScreen: View {
             Text(ElementL10n.loginContinue)
         }
         .buttonStyle(.elementAction(.xLarge))
-        .accessibilityIdentifier("oidcButton")
+        .accessibilityIdentifier(A11yIdentifiers.loginScreen.oidc)
     }
     
     /// Text shown if neither password or OIDC login is supported.
@@ -122,7 +120,7 @@ struct LoginScreen: View {
             .multilineTextAlignment(.center)
             .foregroundColor(.element.primaryContent)
             .frame(maxWidth: .infinity)
-            .accessibilityIdentifier("unsupportedServerText")
+            .accessibilityIdentifier(A11yIdentifiers.loginScreen.unsupportedServer)
     }
     
     /// Parses the username for a homeserver.