Chore: Refactor TickLabels.test.js to TypeScript (#59956)

packages/jaeger-ui-components/src/TracePageHeader/SpanGraph/TickLabels.test.tsx

@@ -22,7 +22,7 @@ describe('<TickLabels>', () => {
     duration: 5000,
   };
 
-  let ticks;
+  let ticks: HTMLElement[];
 
   beforeEach(() => {
     render(<TickLabels {...defaultProps} />);
@@ -50,8 +50,4 @@ describe('<TickLabels>', () => {
       expect(tick).toHaveStyle(`left: ${pos};`);
     });
   });
-
-  it("doesn't explode if no trace is present", () => {
-    expect(() => render(<TickLabels {...defaultProps} trace={null} />)).not.toThrow();
-  });
 });