Remove bootrap alert from gcp offer

What does this MR do?

Remove bootstrap alert from gcp offer

To Reproduce

Update app/helpers/clusters_helper.rb so

  def render_gcp_signup_offer
    #return if Gitlab::CurrentSettings.current_application_settings.hide_third_party_offers?
    #return unless show_gcp_signup_offer?
     return if show_gcp_signup_offer?

    content_tag :section, class: 'no-animate expanded' do
      render 'clusters/clusters/gcp_signup_offer_banner'
    end
  end

Navigate to Admin -> Kubernetes

Screenshots

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Related to #233660 (closed)

Related to gitlab-com/www-gitlab-com#8498 (closed)