Step 1 : include base64 code in pre for mermaid diagrams

and also remove the "word-break: break-all" for mermaid diagrams.

See https://discourse.nodered.org/t/node-red-mermaid-rendering-is-off-by-one/97546 for details

packages/node_modules/@node-red/editor-client/src/js/ui/utils.js

@@ -101,7 +101,7 @@ RED.utils = (function() {
 
     renderer.code = function (code, lang) {
         if(lang === "mermaid") {
-            return `<pre class='mermaid'>${code}</pre>`;
+            return `<pre style='word-break: unset;' data-c64='${btoa(code)}' class='mermaid'>${code}</pre>`;
         } else {
             return "<pre><code>" +code +"</code></pre>";
         }