mgol / bootstrap / 20099725180

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Test(jQuery): Run tests with jQuery 4

To run tests:
```
npm install
npm run js
npm run js-test
```

To test on more remote browsers, replace the last command with:
```
npm run js-test-cloud
```
You'll need to have BrowserStack env variables (`BROWSER_STACK_USERNAME`
& `BROWSER_STACK_ACCESS_KEY`) set up for this to work.

Two changes were required:
1. Replace usage of `$.Deferred` in tests with native Promise as Deferreds are
   no longer available in jQuery 4 slim. Load a Promise polyfill for IE.
2. Replace `false` in `$carousel.attr('data-interval', false)` with `"false"`.
   jQuery Migrate covers this case as well, but it's test-only anyway.

Consolidated test command:
```
npm run js && npm run js-test && npm run js-test-cloud; echo $?; git checkout -- dist js/dist
```

899 of 1006 branches covered (89.36%)

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1 of 2 new or added lines in 1 file covered. (50.0%)

1788 of 1890 relevant lines covered (94.6%)

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