fix(code-snippet): remove focus from snippet container (#5202)

* fix(code-snippet): remove focus from snippet container

* fix(code-snippet): remove focus on mulit-line snippet

* fix(code-snippet): fix show more styles

Author: tw15egan

packages/components/src/components/code-snippet/_code-snippet.scss

@@ -259,6 +259,9 @@
 
   // Show more / less button
   button.#{$prefix}--btn.#{$prefix}--snippet-btn--expand {
+    @include type-style('body-short-01');
+    @include carbon--font-family('sans');
+    border: 0;
     display: inline-flex;
     align-items: center;
     position: absolute;
@@ -299,6 +302,7 @@
 
   .#{$prefix}--snippet-btn--expand:focus {
     @include focus-outline('outline');
+    border-color: transparent;
   }
 
   .#{$prefix}--snippet--expand

packages/components/src/components/code-snippet/code-snippet.hbs

@@ -18,7 +18,8 @@
 
 <div class="{{@root.prefix}}--snippet {{@root.prefix}}--snippet--{{variant}}" {{#is variant "multi"}}
   data-code-snippet{{/is}}>
-  <div class="{{@root.prefix}}--snippet-container" aria-label="Code Snippet Text">
+  <div {{#is variant "single"}}tabindex="0" {{/is}} class="{{@root.prefix}}--snippet-container"
+    aria-label="Code Snippet Text">
     <pre>
 <code>@mixin grid-container {
     width: 100%;

packages/react/src/components/CodeSnippet/CodeSnippet.js

@@ -69,8 +69,8 @@ function CodeSnippet({
   return (
     <div {...rest} className={codeSnippetClasses}>
       <div
-        role="textbox"
-        tabIndex={0}
+        role={type === 'single' ? 'textbox' : null}
+        tabIndex={type === 'single' ? 0 : null}
         className={`${prefix}--snippet-container`}
         aria-label={ariaLabel || copyLabel || 'code-snippet'}>
         <code>