Menubar - Fix buggy, slow loader

[colemanw]

Overview

While testing CiviCRM in Drupal 9 I found that the menubar doesn't load consistently. This is because the javascript that waits for #civicrm-container to be present does so in a slow, convoluted way. This simplifies the code and eliminates the bugginess.

Before

Menubar loads inconsistently.

After

Loads every time, and more efficiently.

Technical Details

This function is supposed to be fast, yet was using lo-dash and jQuery to do things that are much faster to do with vanilla javascript.

[civibot]

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[demeritcowboy]

I don't notice any difference before or after so 🐎

[colemanw]

Thanks @demeritcowboy!