refactor(docs-infra): remove unused styles from `_code.scss` (#40704)

This commit removes some styles from `_code.scss` that are no longer
used (i.e. either their CSS selectors do not match any element in the
app or they are overridden by other rules).

PR Close #40704

aio/src/styles/2-modules/_code.scss

@@ -73,10 +73,6 @@ code-tabs.avoidFile mat-tab-body {
   border: 0.5px solid $anti-pattern;
 }
 
-code-tabs div .mat-tab-body-content {
-  height: auto;
-}
-
 code-tabs .mat-tab-body-wrapper mat-tab-body .mat-tab-body {
   overflow-y: hidden;
 }
@@ -130,7 +126,6 @@ aio-code pre {
   &:hover {
     background: rgba(black, 0.04);
   }
-  white-space: nowrap;
 }
 
 .code-tab-group .mat-tab-body-content {
@@ -138,11 +133,6 @@ aio-code pre {
   transform: none;
 }
 
-
-[role="tabpanel"] {
-    transition: none;
-}
-
 .sidenav-content code a {
   color: inherit;
   font-size: inherit;