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/ServerSelection/View/ServerSelectionScreen.swift

@@ -62,21 +62,21 @@ struct ServerSelectionScreen: View {
             TextField(ElementL10n.ftueAuthChooseServerEntryHint, text: $context.homeserverAddress)
                 .textFieldStyle(.elementInput(labelText: ElementL10n.hsUrl,
                                               footerText: context.viewState.footerMessage,
-                                              isError: context.viewState.isShowingFooterError))
+                                              isError: context.viewState.isShowingFooterError,
+                                              accessibilityIdentifier: A11yIdentifiers.changeServerScreen.server))
                 .keyboardType(.URL)
                 .autocapitalization(.none)
                 .disableAutocorrection(true)
                 .onChange(of: context.homeserverAddress) { _ in context.send(viewAction: .clearFooterError) }
                 .submitLabel(.done)
                 .onSubmit(submit)
-                .accessibilityIdentifier("addressTextField")
             
             Button(action: submit) {
                 Text(context.viewState.buttonTitle)
             }
             .buttonStyle(.elementAction(.xLarge))
             .disabled(context.viewState.hasValidationError)
-            .accessibilityIdentifier("confirmButton")
+            .accessibilityIdentifier(A11yIdentifiers.changeServerScreen.continue)
         }
     }
     
@@ -87,7 +87,7 @@ struct ServerSelectionScreen: View {
                 Button { context.send(viewAction: .dismiss) } label: {
                     Text(ElementL10n.actionCancel)
                 }
-                .accessibilityIdentifier("dismissButton")
+                .accessibilityIdentifier(A11yIdentifiers.changeServerScreen.dismiss)
             }
         }
     }