fix(GRO-1366): add non-null assertion to removeButtons[0]

Fix TypeScript error on line 114: HTMLElement | undefined is not
assignable to Element. Added ! assertion since length guard already
excludes the empty-array case.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/__tests__/PetForm.test.tsx

@@ -111,7 +111,7 @@ describe("PetForm", () => {
     render(<PetForm pet={petWithAlert} onSave={onSave} onCancel={onCancel} />);
     const removeButtons = screen.getAllByRole("button", { name: "" });
     if (removeButtons.length === 0) return;
-    const removeButton = removeButtons[0];
+    const removeButton = removeButtons[0]!;
     if (!removeButton) return;
     fireEvent.click(removeButton);
     expect(screen.queryByText("Allergic to chicken")).toBeNull();