feat(fuselage): Replace typography of Message's user name and Banner's title (#577)

Co-authored-by: Guilherme Gazzo <guilhermegazzo@gmail.com>

Author: juliajforesti

packages/fuselage-ui-kit/.loki/reference/desktop_Surfaces_Message_Actions_With_All_Selects.png

@@ -100,7 +100,7 @@
   &__title {
     margin: 0;
     padding: 0;
-    @include typography.use-font-scale(p4);
+    @include typography.use-font-scale(h5);
 
     &--inline {
       display: inline;

packages/fuselage-ui-kit/.loki/reference/desktop_Surfaces_Message_Actions_With_Button.png

@@ -79,7 +79,7 @@ $message-background-color-focus: functions.theme(
 
     &__name {
       @extend %rcx-margins-header;
-      @include typography.use-font-scale(p4);
+      @include typography.use-font-scale(h5);
       @include typography.use-with-truncated-text();
       flex-shrink: 1;