Add additional fields to DAST Site Profile Form

Implements #225378 (closed)

What does this MR do?

This adds new fields to DAST site profile form

• Integrate Auth related field added in !45870 (merged)
• Add Excluded URLs & Request Headers fields
• Update graphql mutations based on #225406 (closed)
• Put everything behind feature flag

Screenshots (strongly suggested)

With additional fields' FF disabled

Before	After

With additional fields' FF enabled

Initial state	When Auth is enabled

How to test this?

1. Enable the feature flag:

echo "Feature.enable(:security_dast_site_profiles_additional_fields)" | rails c

1. Navigate to the DAST site profile form in your GDK: /:namespace/:project/-/security/configuration/dast_profiles/dast_site_profiles/new
2. Save or update an existing profile
3. Since the backend is currently not ready, the form submit will result in an error