Remove unused files that were migrated to create-block package.

platforms/hubspot/hubspot-adapter.js

@@ -1,5 +1,4 @@
 import {readFile, writeFile, mkdir, copyFile} from "fs/promises";
-import {capitalize} from "../../helpers.js";
 
 export async function buildHubspot(blockName) {
   const distPath = `./exports/hubspot/${blockName}.module`;
@@ -225,3 +224,18 @@ function convertToHubspotField(field = {}) {
       });
   }
 }
+
+export function capitalize(str) {
+  if (typeof str !== 'string') {
+    return '';
+  }
+
+  return str
+    .toLowerCase()
+    .split(/[ -_]/g)
+    .filter((word) => !!word)
+    .map((word) => {
+      return word.charAt(0).toUpperCase() + word.slice(1);
+    })
+    .join(' ');
+}