feat: [FC-0044] Course unit - Copy/paste functionality (#884)

Implement copy/paste.

Co-authored-by: monteri <36768631+monteri@users.noreply.github.com>
Co-authored-by: ihor-romaniuk <ihor.romaniuk@raccoongang.com>

src/course-outline/data/api.js

@@ -434,20 +434,6 @@ export async function setVideoSharingOption(courseId, videoSharingOption) {
   return data;
 }
 
-/**
- * Copy block to clipboard
- * @param {string} usageKey
- * @returns {Promise<Object>}
-*/
-export async function copyBlockToClipboard(usageKey) {
-  const { data } = await getAuthenticatedHttpClient()
-    .post(getClipboardUrl(), {
-      usage_key: usageKey,
-    });
-
-  return camelCaseObject(data);
-}
-
 /**
  * Paste block to clipboard
  * @param {string} parentLocator