Verify window exists before resetting clipboard stub

[boblauer]

What:

Ensure that globalThis.window exists before resetting/detaching the clipboard stub in the afterEach/afterAll hooks.

Why:

Using this library in a test suite does not imply that every test in the suite will run in a browser-like environment. I have a test suite that initializes jsdom to test client-side code, but then tears it down after the tests. I wanted to use this library, but I couldn't because as soon as a test ran that didn't initialize jsdom, this afterEach hook would run and throw an error because globalThis.window was undefined.

How:

Verify that globalThis.window exists inside of the hook. I didn't want to put the check inside of resetClipboardStubOnView because this file is meant to be run in a browser-like environment, so it seemed most appropriate to put the check inside the hook.

Checklist:

• [N/A] Documentation
• [N/A] Tests
• Ready to be merged
  

There were no existing tests related to the afterEach/afterAll hooks, and I wasn't sure how to go about writing a test for those, so this code does not have any unit tests around it.

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