Module development and code questions

I'm using this version of brightcove in D9

"drupal/brightcove": "dev-3146320-D9-compatibility",

and this error showed up when I clicked on edit button.

I'm using module "Commerce Ajax Add to Cart" create button Add to Cart on Detail Product. But when I click "Add to Cart", It got a error 
"[Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/"
 This is a link error.

hello,

i've has installation module google analytics in my server and localhost. but i've already follow step in this linka https://www.youtube.com/watch?v=EOr8A68koEg to do, the module is still not working and tracking id.

Why is not working?

having any solution for this?

 I'm a new Drupal developer and this is my first time writing test for an existing module created by another developer. I am using the WebDriverTestBase with chromedriver. When running the test, the main page does load out in the chromedriver browser. However, when the code below runs, it says Page Not Found. 

I'm currently building Drupal inside a container, enabling the modules(using drush) and running testcases for the modules. I have ran the testcases for module facets using the vendor/phpunit cli command but its taking more than 30 hours for me. The amount of time is relative to other modules like captcha as well. Any idea why its taking so much time?

Need a way to copy users from one Drupal9 instance to another without blowing up the target site.