build: create api goldens for cdk/testing protractor and testbed

tools/public_api_guard/cdk/testing/protractor.d.ts

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+export declare class ProtractorElement implements TestElement {
+    readonly element: ElementFinder;
+    constructor(element: ElementFinder);
+    blur(): Promise<void>;
+    clear(): Promise<void>;
+    click(relativeX?: number, relativeY?: number): Promise<void>;
+    focus(): Promise<void>;
+    getAttribute(name: string): Promise<string | null>;
+    getCssValue(property: string): Promise<string>;
+    getDimensions(): Promise<ElementDimensions>;
+    getProperty(name: string): Promise<any>;
+    hasClass(name: string): Promise<boolean>;
+    hover(): Promise<void>;
+    matchesSelector(selector: string): Promise<boolean>;
+    sendKeys(...keys: (string | TestKey)[]): Promise<void>;
+    sendKeys(modifiers: ModifierKeys, ...keys: (string | TestKey)[]): Promise<void>;
+    text(): Promise<string>;
+}
+
+export declare class ProtractorHarnessEnvironment extends HarnessEnvironment<ElementFinder> {
+    protected constructor(rawRootElement: ElementFinder);
+    protected createEnvironment(element: ElementFinder): HarnessEnvironment<ElementFinder>;
+    protected createTestElement(element: ElementFinder): TestElement;
+    forceStabilize(): Promise<void>;
+    protected getAllRawElements(selector: string): Promise<ElementFinder[]>;
+    protected getDocumentRoot(): ElementFinder;
+    waitForTasksOutsideAngular(): Promise<void>;
+    static loader(): HarnessLoader;
+}

tools/public_api_guard/cdk/testing/testbed.d.ts

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+export declare class TestbedHarnessEnvironment extends HarnessEnvironment<Element> {
+    protected constructor(rawRootElement: Element, _fixture: ComponentFixture<unknown>);
+    protected createEnvironment(element: Element): HarnessEnvironment<Element>;
+    protected createTestElement(element: Element): TestElement;
+    forceStabilize(): Promise<void>;
+    protected getAllRawElements(selector: string): Promise<Element[]>;
+    protected getDocumentRoot(): Element;
+    waitForTasksOutsideAngular(): Promise<void>;
+    static documentRootLoader(fixture: ComponentFixture<unknown>): HarnessLoader;
+    static harnessForFixture<T extends ComponentHarness>(fixture: ComponentFixture<unknown>, harnessType: ComponentHarnessConstructor<T>): Promise<T>;
+    static loader(fixture: ComponentFixture<unknown>): HarnessLoader;
+}
+
+export declare class UnitTestElement implements TestElement {
+    readonly element: Element;
+    constructor(element: Element, _stabilize: () => Promise<void>);
+    blur(): Promise<void>;
+    clear(): Promise<void>;
+    click(relativeX?: number, relativeY?: number): Promise<void>;
+    focus(): Promise<void>;
+    getAttribute(name: string): Promise<string | null>;
+    getCssValue(property: string): Promise<string>;
+    getDimensions(): Promise<ElementDimensions>;
+    getProperty(name: string): Promise<any>;
+    hasClass(name: string): Promise<boolean>;
+    hover(): Promise<void>;
+    matchesSelector(selector: string): Promise<boolean>;
+    sendKeys(...keys: (string | TestKey)[]): Promise<void>;
+    sendKeys(modifiers: ModifierKeys, ...keys: (string | TestKey)[]): Promise<void>;
+    text(): Promise<string>;
+}