Transition dast_site_profile_secret_variables to gitlab_sec schema

Arpit Gogiarequested to merge
472354-transition-dast-site-profile-secret-variables into master

What does this MR do and why?

Transition dast_site_profile_secret_variables to gitlab_sec schema

This is part of a larger initiative to decompose the tables used by Secure: &14196 (closed)

FAQ: &13043 (closed)

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Related to #472354 (closed)

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