fix(material/snack-bar): add max height for snack bar

Adds a max height for the snack bar in case users pass huge strings into it.

Fixes #31996.

Author: crisbeto

src/material/snack-bar/snack-bar-container.scss

@@ -101,6 +101,8 @@ $fallbacks: m3-snack-bar.get-tokens();
   box-sizing: border-box;
   margin: 0;
   padding: 14px $_side-padding 14px 16px;
+  max-height: 50vh;
+  overflow: auto;
 
   [dir='rtl'] & {
     padding-left: $_side-padding;