* For #4396 - Rename BookmarkInteractor methods
Following the naming model used in other Interactors this too will use reactive
method names in the form of "on..." instead of the previous imperative model.
Kept the imperative naming model for the methods from `SelectionInteractor` as
they are a new addition and I'm not sure about the future direction.
* For #4396 - Add a BookmarkController
It abstracts the Fragment behavior in a contract through which various
Interactors can inform about the specific View changes and can ask for
modifications in their container Fragment.
This contract and it's implementation - `DefaultBookmarkController` are the
result of extracting the container Fragment's business logic from
`BookmarkFragmentInteractor` in it's own standalone component.
* For #4396 - Refactored Bookmark related tests
Added a new `BookmarkControllerTest` tests class which complements the new
`BookmarkController` to ensure that it properly operates on `BookmarkFragment`
Also refactored the existing `BookmarkFragmentInteractorTest` to accommodate
`BookmarkFragmentInteractor`'s now more specialized behavior.
* fixes#4434 - made close button for collections more accessible.
set recommended minimum size for accessibility 48x48, while keeping image size the same
removed margin from button as it was not needed anymore
aligned close button in center of tab to be visual consistent with alignment of favicon and more visual accessible
implemented same visual solution as for #4193 - close button for tabs
* fixes#4434 - made buttons for collection home list row more accessible and aligned 3 dot menu with individual tabs close button
set buttons sizes to recommended minimum size for accessibility 48x48, while keeping image size the same
removed margins from buttons as they were not needed anymore
aligned center of menu buttons with center of collection icon
constrained description top to bottom of title, instead of share button to reduce empty space. (overlap with share button is already prevented by end constraint of description)
* Add no-op experiment to test service-experiments integration
* Shorten metric name to meet schema
* Add active_experiment metric to docs
* Add approved data review
