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>

res/css/views/elements/_FacePile.scss

@@ -37,7 +37,7 @@ limitations under the License.
             border-radius: 100%;
             width: 30px;
             height: 30px;
-            background-color: $groupFilterPanel-bg-color;
+            background-color: $spacePanel-bg-color;
 
             &::before {
                 content: "";

res/css/views/elements/_RichText.scss

@@ -4,7 +4,6 @@
 
 .mx_UserPill,
 .mx_RoomPill,
-.mx_GroupPill,
 .mx_AtRoomPill {
     display: inline-flex;
     align-items: center;
@@ -28,13 +27,6 @@ a.mx_Pill {
     line-height: $font-17px;
 }
 
-/* More specific to override `.markdown-body a` color */
-.mx_EventTile_content .markdown-body a.mx_GroupPill,
-.mx_GroupPill {
-    color: $accent-fg-color;
-    background-color: $rte-room-pill-color;
-}
-
 /* More specific to override `.markdown-body a` text-decoration */
 .mx_EventTile_content .markdown-body a.mx_Pill {
     text-decoration: none;
@@ -62,22 +54,18 @@ a.mx_Pill {
 
 /* More specific to override `.markdown-body a` color */
 .mx_EventTile_content .markdown-body a.mx_RoomPill,
-.mx_EventTile_content .markdown-body a.mx_GroupPill,
-.mx_RoomPill,
-.mx_GroupPill {
+.mx_RoomPill {
     color: $accent-fg-color;
     background-color: $rte-room-pill-color;
 }
 
 .mx_EventTile_body .mx_UserPill,
-.mx_EventTile_body .mx_RoomPill,
-.mx_EventTile_body .mx_GroupPill {
+.mx_EventTile_body .mx_RoomPill {
     cursor: pointer;
 }
 
 .mx_UserPill .mx_BaseAvatar,
 .mx_RoomPill .mx_BaseAvatar,
-.mx_GroupPill .mx_BaseAvatar,
 .mx_AtRoomPill .mx_BaseAvatar {
     position: relative;
     display: inline-flex;