Move ToastContext and utilities to shared components (#33949)

* Move ToastContext and utilities to shared components

* lint

* fix type

* cleanup

* fix broken test

* fix lint

* Add more tests for ToastContext

* Potential fix for pull request finding 'Unused variable, import, function or class'

Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

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Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com>

apps/web/test/unit-tests/components/views/settings/tabs/user/AccountUserSettingsTab-test.tsx

@@ -12,6 +12,7 @@ import { type MatrixClient, ThreepidMedium } from "matrix-js-sdk/src/matrix";
 import { logger } from "matrix-js-sdk/src/logger";
 import userEvent from "@testing-library/user-event";
 import { type MockedObject } from "jest-mock-vitest-adapter";
+import { ToastContext, ToastRack } from "@element-hq/web-shared-components";
 
 import AccountUserSettingsTab from "../../../../../../../src/components/views/settings/tabs/user/AccountUserSettingsTab";
 import { SdkContextClass, SDKContext } from "../../../../../../../src/contexts/SDKContext";
@@ -54,7 +55,9 @@ describe("<AccountUserSettingsTab />", () => {
     const getComponent = () => (
         <MatrixClientContext.Provider value={mockClient}>
             <SDKContext.Provider value={stores}>
-                <AccountUserSettingsTab {...defaultProps} />
+                <ToastContext.Provider value={new ToastRack()}>
+                    <AccountUserSettingsTab {...defaultProps} />
+                </ToastContext.Provider>
             </SDKContext.Provider>
         </MatrixClientContext.Provider>
     );