This commit refactors the e2e tests of the `component-interaction` docs
example to improve readability and make them easier to maintain.
Changes include:
- Switch from `element.all().get(0)` to `element()` when there is only
one such element on the page.
- Switch from `Promise#then()` to `async/await`.
- Move `ElementFinder`s at the top of the test (instead of having them
interleaved with expectations).
- Load the page before every test (i.e. in a `beforeEach()` instead of
`beforeAll()`) to prevent state from each test leaking into the
subsequent tests.
- Order imports alphabetically.
PR Close#39001
2df39ee338