Prepare On-Demand DAST for CI sharding initiative

- Add disable_joins to relevant CI models
- Add new feature flags enabled by default

Changelog: changed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66709

config/feature_flags/development/dast_profile_disable_joins.yml

+---
+name: dast_profile_disable_joins
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66709
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/336944
+milestone: '14.2'
+type: development
+group: group::dynamic analysis
+default_enabled: true

config/feature_flags/development/dast_scanner_profile_disable_joins.yml

+---
+name: dast_scanner_profile_disable_joins
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66709
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/336946
+milestone: '14.2'
+type: development
+group: group::dynamic analysis
+default_enabled: true

config/feature_flags/development/dast_site_profile_disable_joins.yml

+---
+name: dast_site_profile_disable_joins
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/66709
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/336945
+milestone: '14.2'
+type: development
+group: group::dynamic analysis
+default_enabled: true

ee/app/models/ee/ci/build.rb

@@ -33,10 +33,10 @@ module EE
         has_many :security_scans, class_name: 'Security::Scan'
 
         has_one :dast_site_profiles_build, class_name: 'Dast::SiteProfilesBuild', foreign_key: :ci_build_id
-        has_one :dast_site_profile, class_name: 'DastSiteProfile', through: :dast_site_profiles_build
+        has_one :dast_site_profile, class_name: 'DastSiteProfile', through: :dast_site_profiles_build, disable_joins: -> { ::Feature.enabled?(:dast_site_profile_disable_joins, default_enabled: :yaml) }
 
         has_one :dast_scanner_profiles_build, class_name: 'Dast::ScannerProfilesBuild', foreign_key: :ci_build_id
-        has_one :dast_scanner_profile, class_name: 'DastScannerProfile', through: :dast_scanner_profiles_build
+        has_one :dast_scanner_profile, class_name: 'DastScannerProfile', through: :dast_scanner_profiles_build, disable_joins: -> { ::Feature.enabled?(:dast_scanner_profile_disable_joins, default_enabled: :yaml) }
 
         after_commit :track_ci_secrets_management_usage, on: :create
         delegate :service_specification, to: :runner_session, allow_nil: true

ee/app/models/ee/ci/pipeline.rb

@@ -21,7 +21,7 @@ module EE
         has_many :security_findings, class_name: 'Security::Finding', through: :security_scans, source: :findings
 
         has_one :dast_profiles_pipeline, class_name: 'Dast::ProfilesPipeline', foreign_key: :ci_pipeline_id
-        has_one :dast_profile, class_name: 'Dast::Profile', through: :dast_profiles_pipeline
+        has_one :dast_profile, class_name: 'Dast::Profile', through: :dast_profiles_pipeline, disable_joins: -> { ::Feature.enabled?(:dast_profile_disable_joins, default_enabled: :yaml) }
 
         has_one :source_project, class_name: 'Ci::Sources::Project', foreign_key: :pipeline_id