Fix broken rspec for scan profile promotion modal

What does this MR do and why?

Fixes a QA spec by properly handling the scan profile promotion modal that appears on the security configuration page.

MR which introduced the modal: Add scan profile promotional modal (!218117 - merged) • Dheeraj Joshi • 18.9

Broken specs:

• https://gitlab.com/gitlab-org/quality/test-failure-issues/-/work_items/30762
• https://gitlab.com/gitlab-org/quality/test-failure-issues/-/work_items/30763

Screenshots or screen recordings

Before	After

How to set up and validate locally

Enable FF on GDK:

http://gdk.test:3000/rails/features/security_scan_profiles_feature and toggle

Run

❯ WEBDRIVER_HEADLESS=false bundle exec bin/qa Test::Instance::All http://127.0.0.1:3000/ ./qa/specs/features/ee/browser_ui/13_secure/secret_push_protection_spec.rb

Should not fail with

     Failure/Error: config_form.enable_secret_detection

     Selenium::WebDriver::Error::ElementClickInterceptedError:
       element click intercepted: Element <svg data-testid="close-xs-icon" role="img" aria-hidden="true" class="gl-icon s12 gl-fill-current">...</svg> is not clickable at point (283, 776). Other element would receive the click: <div id="scanner-profile-launch-modal" role="dialog" aria-describedby="scanner-profile-launch-modal___BV_modal_body_" class="modal fade show gl-block gl-modal" aria-modal="true" style="">...</div>
         (Session info: chrome=144.0.7559.133)

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