Update all relations to use `disable_joins:` that cross join many DBs

As part of identified changes of PoC is to mark relations that cross-join DBs to prefer to use SELECT id instead of LEFT JOIN.

class Runner
   has_many :projects, through: :runner_projects, disable_joins: true
end

Identified relations

Model	Relation	Group (?)	Issue	Feature Flag
Environment	last_deployable	group::release
Environment	last_visible_deployable	group::release
Ci::Pipeline	deployments	group::release
Ci::Pipeline	environments	group::release
Ci::Runner	projects	group::verify
Ci::Runner	groups	group::verify
Packages::PackageFile	pipelines	group::package
Packages::Package	pipelines	group::package
Dast::Profile	ci_pipelines	group::security
Project	upstream_projects	group::verify
Project	downstream_projects	group::verify
Ci::Pipeline	security_scans	group::security
Security::Finding	pipelines	group::security
Vulnerabilities::Finding	pipelines	group::security

Proposal

1. Use backported disable_joins: #336420 (closed)
2. For each relation use a lambda syntax to feature-flag it
3. Validate performance and make disable_joins: true permament