Add composite identity enforce setting to users

What does this MR do and why?

Adds a new composite_identity_enforced column to users with default value false. This can be used to create service accounts with enforcing composite identity added in Add composite identity support using RequestSto... (!173006 - merged).

Exception request to add new column to users: https://gitlab.com/gitlab-org/database-team/team-tasks/-/issues/476+

Migration output

up

$ bundle exec rake db:migrate                                                                                  ─╯
DEPRECATION WARNING: Support for Rails versions < 7.1 is deprecated and will be removed from ViewComponent 4.0.0 (ViewComponent v4 will remove support for Rails versions < 7.1 no earlier than April 1, 2025) (called from <main> at /Users/ifarkas/code/gitlab-development-kit/gitlab/config/environment.rb:7)
main: == [advisory_lock_connection] object_id: 130360, pg_backend_pid: 52338
main: == 20241127135043 AddCompositeIdentityEnforcedToUsers: migrating ==============
main: -- add_column(:users, :composite_identity_enforced, :boolean, {:default=>false, :null=>false})
main:    -> 0.0045s
main: == 20241127135043 AddCompositeIdentityEnforcedToUsers: migrated (0.0086s) =====

main: == [advisory_lock_connection] object_id: 130360, pg_backend_pid: 52338
ci: == [advisory_lock_connection] object_id: 130700, pg_backend_pid: 52340
ci: == 20241127135043 AddCompositeIdentityEnforcedToUsers: migrating ==============
ci: -- add_column(:users, :composite_identity_enforced, :boolean, {:default=>false, :null=>false})
ci:    -> 0.0037s
ci: == 20241127135043 AddCompositeIdentityEnforcedToUsers: migrated (0.0109s) =====

ci: == [advisory_lock_connection] object_id: 130700, pg_backend_pid: 52340

down

$ bundle exec rake db:migrate:down:main VERSION=20241127135043                                                 ─╯
DEPRECATION WARNING: Support for Rails versions < 7.1 is deprecated and will be removed from ViewComponent 4.0.0 (ViewComponent v4 will remove support for Rails versions < 7.1 no earlier than April 1, 2025) (called from <main> at /Users/ifarkas/code/gitlab-development-kit/gitlab/config/environment.rb:7)
main: == [advisory_lock_connection] object_id: 129920, pg_backend_pid: 53569
main: == 20241127135043 AddCompositeIdentityEnforcedToUsers: reverting ==============
main: -- remove_column(:users, :composite_identity_enforced, :boolean, {:default=>false, :null=>false})
main:    -> 0.0020s
main: == 20241127135043 AddCompositeIdentityEnforcedToUsers: reverted (0.0073s) =====

main: == [advisory_lock_connection] object_id: 129920, pg_backend_pid: 53569

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