Clipboard - Check for window existence in `afterAll` functions

[EgoziE]

What: Added a verification that window exists in functions resetClipboardStubOnView and detachClipboardStubFromView which are called on afterAll.

Why: When testing in SSR environment, window does (and should) not exist, therefore my tests fail.

How: Just added a conditional chaining.

Checklist:

• [ ] Documentation
• [ ] Tests
• [x] Ready to be merged

I believe these functions should not be called in afterAll at all unless the user is actively using clipboard functionality. Thanks 💛

[codesandbox-ci[bot]]

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[EgoziE]

I didn't notice, it's almost a copy of https://github.com/testing-library/user-event/pull/1176 Please accept either PR 🙏🏼

[ph-fritsche]

resolved by #1176