Use semantic headings in user settings - discovery (#10838)

* allow testids in settings sections

* use semantic headings in LabsUserSettingsTab

* put back margin var

* use SettingsTab wrapper

* use semantic headings for deactivate acc section

* use semantic heading in manage integratios

* i18n

* use currentColor in warning-triangle svg, update use in RoomStatusBar

* use semantic headings for discovery section

* test manage integration settings

* test deactivate account section display

* remove SettingsFieldset margins

* threepids styles

* remove debug

* test discovery email and phone

res/img/feather-customised/warning-triangle.svg

@@ -3,7 +3,7 @@
 <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
 	 viewBox="0 0 14 12" style="enable-background:new 0 0 14 12;" xml:space="preserve">
 <style type="text/css">
-	.st0{fill:none;stroke:#454545;stroke-linecap:round;stroke-linejoin:round;}
+	.st0{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;}
 </style>
 <g>
 	<path class="st0" d="M6,1.5L1.2,9.3c-0.2,0.3-0.2,0.8,0,1.1c0.2,0.3,0.6,0.6,1,0.6h9.7c0.4,0,0.8-0.2,1-0.6c0.2-0.3,0.2-0.8,0-1.1