Update validation form to use initForm helper

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With this MR > !61213 (merged), we now have a helper function that makes it easier to create the form object that is structure compliant with the use of the validation directive. Let's update our existing vue files to use this helper 🙌

• app/assets/javascripts/pages/projects/forks/new/components/fork_form.vue
• ee/app/assets/javascripts/on_demand_scans/components/on_demand_scans_form.vue
• ee/app/assets/javascripts/security_configuration/dast_scanner_profiles/components/dast_scanner_profile_form.vue
• ee/app/assets/javascripts/security_configuration/dast_site_profiles_form/components/dast_site_auth_section.vue
• ee/app/assets/javascripts/security_configuration/dast_site_profiles_form/components/dast_site_profile_form.vue

And remove

• ee/app/assets/javascripts/security_configuration/utils.js