Fix Google reCAPTCHA form submit button not visible in pipelines CC form

What does this MR do and why?

This MR resolves #378041 (closed).

To accommodate Google reCAPTCHA challenge form, the height of the iframe is set to 480px. Without doing this, the iframe height is insufficient to display the challenge form in its entirety and the submit button of the form is not visible to the user and cannot be clicked.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Set up Customers app. Ensure you have zuora_payment_method_validation_page_id configured to an HPM form with captcha enabled

2. Start GDK with SIMULATE_GITLAB_SAAS=1

3. To make things easier, update User#requires_credit_card? to

   # ee/app/models/ee/user.rb
   def requires_credit_card?(project)
      return true
   end

4. Login root (make sure it has no associated Users::CreditCardValidation record), go to http://localhost:3000/flightjs/Flight/-/pipelines/new, set the branch to anything other than master then click Run pipeline

5. You should see "User validation required" alert

   

6. Click on "Validate account", click on the Google reCAPTCHA checkbox

7. Validate that you can see the entirety of the challenge form

   

MR acceptance checklist

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