Add enforcement_type in policy schema and policy read model

Imam Hossainrequested to merge
561885-be-implement-enforcement_type-schema-and-policy-configuration-for-warn-mode into master

What does this MR do and why?

Introduces a new 'enforcement_type' field for scan result policies. This allows policies to be configured in 'warn' or 'enforce' mode.

'Warn' mode displays violations without blocking merge requests, while 'enforce' (default) blocks them.

Database, model enums, JSON schemas, and policy logic are updated to support this.

References

MVC: !202414 (closed)

Related to #561885 (closed)

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Related to #561885 (closed)

Edited by Imam Hossain

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