New UI features

[eiksta]

New UIFeature flags + tests for verji-develop

[thoraj]

We aim to have a green board for the checks before we merge.
So:

• Take care of adding an appropriate label to the PR
• Fix failing test
• Fix linting errors

[eiksta]

New UIFeature flags for CreateRoom, UserInfo, RoomList and Homepage

Create room
As we want our users to only create Private encrypted rooms, ve wish to have some of the options in create room encapsuled by UIFeatureflags. This way we can ensure that all rooms are private, encrypted and not public and knockable.
CreateRoomE2eeSection = "UIFeature.createRoomE2eeSection",
CreateRoomShowJoinRuleDropdown = "UIFeature.createRoomShowJoinRuleDropdown",
CreateRoomShowAdvancedSettings = "UIFeature.createRoomShowAdvancedSettings",

UserInfo
As our customers are using Element/Verji for business purposes, we want to restrict the users to delete (redact) messages, and to share the link to other users, to prevent unwanted/uninvited people into rooms.
UserInfoVerifyDevice = "UIFeature.userInfoVerifyDevice",
UserInfoShareLinkToUserButton = "UIFeature.userInfoShareLinkToUserButton",
UserInfoRedactButton = "UIFeature.userInfoRedactButton",

Homepage
We would like to hide the 3 buttons from the HomePage behind an UIFeature flag, to prevent our users to have multiple ways of doing things.
HomePageButtons = "UIFeature.homePageButtons",

RoomList
When creating a new room from the Roomlist, 2 choices appear, New Room and Explore public rooms. As we dont use public rooms, we would like to hide the option behind a feature flag.
RoomListExplorePublicRooms = "UIFeature.roomListExplorePublicRooms",

In this way we, and possible others, take benefit of not manually handle these changes inhouse on a later stage.