Next Week should mean next Monday, Next Month - the first day of the next month, and so on.
Also, we'll be using the name "Next Monday" instead of "Next Week" because it's easier to understand. No one can get confused by next Monday.
The problem was happening in component integration tests on the rendering stage, sometimes the rendering would never finish.
Using time moments in the future when faking time solves the problem. Unfortunately, I don't know why exactly it helps. It was just a lucky guess after some hours I spent trying to figure out what's going on. But I've done a lot of testings, so looks like it really works. I'll be monitoring builds for some time after merging this anyway.
Unit tests seem to work alright with moments in the past. And we don't fake time in acceptance tests at the moment but I guess they would very likely be flaky with time moments from the past since they also do rendering.
I'm actually thinking of moving all fake time moments to the future (including moments in unit tests) to decrease the chances of flakiness. But I don't want to do everything in one PR, because I can accidentally introduce new flakiness.
A pretty easy way of picking time moments in the future for tests is to use the 2100 year. It has the same calendar as 2021. If a day is Monday in 2021 it's Monday in 2100 too.
This PR moves all of the time picking functionality from the bookmark modal and controller into a reusable time-shortcut-picker component, which will be used for the topic timer UI revamp. All of the utility JS for getting dates like tomorrow/next week/next month etc. have also been moved into a separate utility lib.
The time-shortcut-picker has a couple of options that can be passed in:
* prefilledDatetime - The date and time to parse and prefill into the custom date and time section, useful for editing interfaces.
* onTimeSelected (callback) - Called when one of the time shortcuts is clicked, and passes the type of the shortcut (e.g. tomorrow) and the datetime selected.
* additionalOptionsToShow - An array of option ids to show (by default `later_today` and `later_this_week` are hidden)
* hiddenOptions - An array of option ids to hide
* customOptions - An array of custom options to display (e.g. the option to select a post date for the bookmarks modal). The options should have the below properties:
* id
* icon
* label (I18n key)
* time (moment datetime object)
* timeFormatted
* hidden
The other major work in this PR is moving all of the bookmark functionality out of the bookmark modal controller and into its own component, where it makes more sense to be able to access elements on the page via `document`. Tests have been added to accompany this move, and existing acceptance tests for bookmark are all passing.
