HtmlReporter shows error alerts for afterAllExceptions

-Add list of exceptions in HtmlReporter to push to on error
-Create alerts for each exception in the list (with stack trace)

[#67055688]

src/html/_HTMLReporter.scss

@@ -152,7 +152,7 @@ body {
     color: #eee;
 
     &.failed {
-      background-color: $failing-color
+      background-color: $failing-color;
     }
 
     &.passed {
@@ -163,6 +163,10 @@ body {
       background-color: $neutral-color;
     }
 
+    &.errored {
+      background-color: $failing-color;
+    }
+
     &.menu {
       background-color: #fff;
       color: $faint-text-color;