Use semantic headings in user settings - account (#10972)

* account password section

* account email and phone numbers

* update cypress selectors

res/css/views/elements/_TagComposer.pcss

@@ -17,16 +17,12 @@ limitations under the License.
 .mx_TagComposer {
     .mx_TagComposer_input {
         display: flex;
-
-        .mx_Field {
-            flex: 1;
-            margin: 0; /* override from field styles */
-        }
+        flex-direction: row;
 
         .mx_AccessibleButton {
             min-width: 70px;
             padding: 0 8px; /* override from button styles */
-            margin-left: 16px; /* distance from <Field> */
+            align-self: stretch; /* override default settingstab style */
         }
 
         .mx_Field,