Transition dast_sites to loose foreign keys

Arpit Gogiarequested to merge
472348-transition-dast-sites into master

What does this MR do and why?

Transitions the table dast_sites 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 #472348 (closed)

Edited by Arpit Gogia

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