Fix WebAuthn authenticator options copying.

In WebauthnPane, create a shallow copy of `#newAuthenticatorOptions` when adding a new authenticator to prevent unintended side effects. 

Bug: 443752807
Change-Id: I7e7cc65566a2137acb425810fd01775039461bee
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6948390
Reviewed-by: Philip Pfaffe <[email protected]>
Commit-Queue: Danil Somsikov <[email protected]>

Author: danilsomsikov

front_end/panels/webauthn/WebauthnPane.ts

@@ -748,7 +748,7 @@ export class WebauthnPaneImpl extends UI.Panel.Panel implements
   }
 
   async #handleAddAuthenticatorButton(): Promise<void> {
-    const options = this.#newAuthenticatorOptions;
+    const options = {...this.#newAuthenticatorOptions};
     if (this.#model) {
       const authenticatorId = await this.#addAuthenticator(options);
       this.#activeAuthId = authenticatorId;  // Newly added authenticator is automatically set as active.