fix(copyText) use a helper library

It does a more elaborate way of textarea copying, hopefully it's more reliable.

package-lock.json

       "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
       "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk="
     },
+    "clipboard-copy": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/clipboard-copy/-/clipboard-copy-4.0.1.tgz",
+      "integrity": "sha512-wOlqdqziE/NNTUJsfSgXmBMIrYmfd5V0HCGsR8uAKHcg+h9NENWINcfRjtWGU77wDHC8B8ijV4hMTGYbrKovng=="
+    },
     "cliui": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",

package.json

     "amplitude-js": "7.3.3",
     "base64-js": "1.3.1",
     "bc-css-flags": "3.0.0",
+    "clipboard-copy": "4.0.1",
     "dropbox": "4.0.9",
     "focus-visible": "5.1.0",
     "i18n-iso-countries": "3.7.8",

react/features/base/util/helpers.js

 // @flow
 
+import clipboardCopy from 'clipboard-copy';
+
 /**
  * A helper function that behaves similar to Object.assign, but only reassigns a
  * property in target if it's defined in source.
  */
 export async function copyText(textToCopy: string) {
     try {
-        await navigator.clipboard.writeText(textToCopy);
+        await clipboardCopy(textToCopy);
 
         return true;
-    } catch (clipboardAPIError) { // The Clipboard API is not supported.
-        let fakeTextArea = document.createElement('textarea');
-
-        // $FlowFixMe
-        fakeTextArea = document.body.appendChild(fakeTextArea);
-        fakeTextArea.value = textToCopy;
-        fakeTextArea.focus();
-        fakeTextArea.select();
-
-        let result;
-
-        try {
-            result = document.execCommand('copy');
-        } catch (error) {
-            result = false;
-        }
-
-        // $FlowFixMe
-        document.body.removeChild(fakeTextArea);
-
-
-        return result;
+    } catch (e) {
+        return false;
     }
 }