Set common width, white-space, and display values to MessageTimestamp (#8818)

* Add mx_MessageTimestamp to mx_PinnedEventTile_timestamp

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Apply display: block globally to enable the width declaration

- Unset display and width value of timestamp on pinned messages card

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Apply nowrap globally

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* MessageTimestamp on ThreadsList - Remove width setting and add font-size setting

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant font-size declaration from Threadview

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Fix timestamp position of timestamp on ThreadView in IRC layout

- GroupLayout is modern layout, not IRC layout

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant font-size declaration from IRC layout

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Remove redundant color setting from timestamp on file panel

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Cancel the default width to set a gap between the event tile line

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

* Apply user-select: none globally

Signed-off-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

res/css/views/rooms/_PinnedEventTile.scss

@@ -89,13 +89,13 @@ limitations under the License.
 
     .mx_PinnedEventTile_footer {
         grid-area: footer;
-        font-size: 10px;
+        font-size: $font-10px;
         line-height: 12px;
 
         .mx_PinnedEventTile_timestamp {
-            font-size: inherit;
-            line-height: inherit;
             color: $secondary-content;
+            display: unset;
+            width: unset; // Cancel the default width value
         }
 
         .mx_AccessibleButton_kind_link {