Add "check your email" page

A problem for this issue is that while the VerifyEmail entity was available in the form build, it was not available in the submit method.

Since 📌 Create service for email verification Active is completed, the entity is stored in $form_state, so is available in the rest of the form.

I will add some additional detail to the issue.

@dhruv.mittal are you still working on this?

Thanks for working on this. It looks great, but there are a few small points.

The test is currently failing because the page title is actually "Thank you | Drupal". However, I think it's better to check the <h1> text.

I've also made some other suggestions, mainly around passing the entity into the controller parameter instead of the entity ID.

Finally, there are some PHPCS errors that should be fixed.

Please review

Assigning this to myself to resolve the phpch issues.

Tests are currently failing. The problem is that we are still passing a parameter to the controller called `$entity_id`, but the controller is expecting it to be called `$entity`. We need to update the parameter name to correct this.

Pipeline is passed now!

I think we're almost there. I just think the name of the controller is a little unwieldy. I think we can shorten that and we should be ready to merge.

I have reviewed the change, and everything looks good. I've also tested manually, and run the tests locally. The pipelines are all green, so let's move to RTBC.

Change merged.

Thanks dhruv.mittal and nidhi27 for your assistance.