ops: enable GitLab SAST scanning (DCF-712)

Nikolay Samokhvalovrequested to merge
ops/enable-sast-dcf712 into master

Enables GitLab SAST scanning in the CI/CD pipeline as part of SOC2 compliance work.

Issue: https://gitlab.com/postgres-ai/infra/-/work_items/29

Edited by Cap PG

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