Delete groups (legacy communities system) (#8027)

* Remove deprecated feature_communities_v2_prototypes

* Update _components

* i18n

* delint

* Cut out a bit more dead code

* Carve into legacy components

* Carve into mostly the room list code

* Carve into instances of "groupId"

* Carve out more of what comes up with "groups"

* Carve out some settings

* ignore related groups state

* Remove instances of spacesEnabled

* Fix some obvious issues

* Remove now-unused css

* Fix variable naming for legacy components

* Update i18n

* Misc cleanup from manual review

* Update snapshot for changed flag

* Appease linters

* rethemedex

* Remove now-unused AddressPickerDialog

* Make ConfirmUserActionDialog's member a required prop

* Remove useless override from RightPanelStore

* Remove extraneous CSS

* Update i18n

* Demo: "Communities are now Spaces" landing page

* Restore linkify for group IDs

* Demo: Dialog on click for communities->spaces notice

* i18n for demos

* i18n post-merge

* Update copy

* Appease the linter

* Post-merge cleanup

* Re-add spaces_learn_more_url to the new SdkConfig place

* Round 1 of post-merge fixes

* i18n

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/dialogs/UserSettingsDialog.tsx

@@ -28,7 +28,6 @@ import NotificationUserSettingsTab from "../settings/tabs/user/NotificationUserS
 import PreferencesUserSettingsTab from "../settings/tabs/user/PreferencesUserSettingsTab";
 import VoiceUserSettingsTab from "../settings/tabs/user/VoiceUserSettingsTab";
 import HelpUserSettingsTab from "../settings/tabs/user/HelpUserSettingsTab";
-import FlairUserSettingsTab from "../settings/tabs/user/FlairUserSettingsTab";
 import SdkConfig from "../../../SdkConfig";
 import MjolnirUserSettingsTab from "../settings/tabs/user/MjolnirUserSettingsTab";
 import { UIFeature } from "../../../settings/UIFeature";
@@ -41,7 +40,6 @@ import KeyboardUserSettingsTab from "../settings/tabs/user/KeyboardUserSettingsT
 export enum UserTab {
     General = "USER_GENERAL_TAB",
     Appearance = "USER_APPEARANCE_TAB",
-    Flair = "USER_FLAIR_TAB",
     Notifications = "USER_NOTIFICATIONS_TAB",
     Preferences = "USER_PREFERENCES_TAB",
     Keyboard = "USER_KEYBOARD_TAB",
@@ -103,15 +101,6 @@ export default class UserSettingsDialog extends React.Component<IProps, IState>
             <AppearanceUserSettingsTab />,
             "UserSettingsAppearance",
         ));
-        if (SettingsStore.getValue(UIFeature.Flair)) {
-            tabs.push(new Tab(
-                UserTab.Flair,
-                _td("Flair"),
-                "mx_UserSettingsDialog_flairIcon",
-                <FlairUserSettingsTab />,
-                "UserSettingFlair",
-            ));
-        }
         tabs.push(new Tab(
             UserTab.Notifications,
             _td("Notifications"),