Prevent accidental use of globals

[Gudahtt]

Previously all browser globals were allowed to be used anywhere by ESLint because we had set the env property to browser in the ESLint config. This has made it easy to accidentally use browser globals (e.g. #8338), so it has been removed. Instead we now have a short list of allowed globals.

All browser globals are now accessed as properties on window.

Unfortunately this change resulted in a few different confusing unit test errors, as some of our unit tests setup assumed that a particular global would be used via window or global. In particular,
window.fetch didn't work correctly because it wasn't patched by the AbortController polyfill (only global.fetch was being patched). The jsdom-global package we were using complicated matters by setting all of the JSDOM window properties directly on global, overwriting the AbortController for example.

The helpers.js test setup module has been simplified somewhat by removing jsdom-global and constructing the JSDOM instance manually. The JSDOM window is set on window, and a few properties are set on global as well as needed by various dependencies. node-fetch and
the AbortController polyfill/patch now work as expected as well, though fetch is only available on window now.

[Gudahtt]

This PR is in draft because it depends upon #8336, #8337, #8338, and #8339. They've been cherry-picked into this branch for now; I'll rebase this once they're all merged.

Only the final commit (dfa937d82f20253aa6a9ec316a90e6510eff9cba) should be considered for review; the other commits are from the other PRs.

Edit: All of the mentioned PRs have been merged, and this branch has been rebased. It's now ready for review.

[metamaskbot]

Builds ready [dfa937d]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• dep viz: background
• all artifacts

Page Load Metrics (678 ± 33 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Notification	firstPaint	37	59	42	5	3
		domContentLoaded	429	797	676	70	33
		load	431	798	678	70	33
		domInteractive	428	796	676	70	33

[metamaskbot]

Builds ready [bffe288]

• builds: chrome, firefox, opera
• bundle viz: background, ui, inpage, contentscript, ui-libs, bg-libs, phishing-detect
• dep viz: background
• all artifacts

Page Load Metrics (700 ± 53 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Notification	firstPaint	38	92	54	18	9
		domContentLoaded	367	845	698	110	53
		load	369	848	700	110	53
		domInteractive	367	845	697	110	53

[whymarrh]

LGTM! Thanks for cleaning this up!