Migrate case assignees to participants who aren't individuals

[wssheldon]

Resolves an issue where Assignee's that have never participated in an incident fail to be migrated to the Participant model.

Tested using, where 12460 is not an individual:

dispatch=# INSERT INTO dispatch_organization_default.case (id, name, assignee_id, title, description, resolution, status, visibility, case_priority_id, case_severity_id, case_type_id, project_id)
VALUES (37, 'TICKET-37', 12460, 'test', 'test', 'done', 'Triage', 'Open', 3, 4, 2, 1);
INSERT 0 1

Output:

(dispatch) wshel@Wills-MacBook-Pro dispatch % dispatch database upgrade                                            
DEBUG:Configuring extensions...:/Users/wshel/Projects/dispatch/src/dispatch/extensions.py:configure_extensions:25
INFO:Migrating dispatch core schema...:/Users/wshel/Projects/dispatch/src/dispatch/database/revisions/core/env.py:run_migrations_online:51
INFO:Context impl PostgresqlImpl.:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:__init__:204
INFO:Will assume transactional DDL.:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:__init__:207
INFO:Migrating dispatch_organization_default...:/Users/wshel/Projects/dispatch/src/dispatch/database/revisions/tenant/env.py:run_migrations_online:60
INFO:Context impl PostgresqlImpl.:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:__init__:204
INFO:Will assume transactional DDL.:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:__init__:207
INFO:Running upgrade 6e53722fa1f2 -> e23c468440c9, Sets a default search filter creator:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:run_migrations:618
DEBUG:update 6e53722fa1f2 to e23c468440c9:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:update_to_step:853
INFO:Running upgrade e23c468440c9 -> 956eb8f8987e, empty message:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:run_migrations:618
DEBUG:update e23c468440c9 to 956eb8f8987e:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:update_to_step:853
INFO:Running upgrade 956eb8f8987e -> e4b4991dddcd, empty message:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:run_migrations:618
Migrating case assignees to Participant from DispatchUser..
Processing Case 36...
Processing Case 24...
Processing Case 21...
Processing Case 22...
Processing Case 35...
Processing Case 37...
DEBUG:update 956eb8f8987e to e4b4991dddcd:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:update_to_step:853
INFO:Migrating dispatch_organization_training...:/Users/wshel/Projects/dispatch/src/dispatch/database/revisions/tenant/env.py:run_migrations_online:60
INFO:Context impl PostgresqlImpl.:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:__init__:204
INFO:Will assume transactional DDL.:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:__init__:207
INFO:Running upgrade 6e53722fa1f2 -> e23c468440c9, Sets a default search filter creator:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:run_migrations:618
DEBUG:update 6e53722fa1f2 to e23c468440c9:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:update_to_step:853
INFO:Running upgrade e23c468440c9 -> 956eb8f8987e, empty message:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:run_migrations:618
DEBUG:update e23c468440c9 to 956eb8f8987e:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:update_to_step:853
INFO:Running upgrade 956eb8f8987e -> e4b4991dddcd, empty message:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:run_migrations:618
Migrating case assignees to Participant from DispatchUser..
DEBUG:update 956eb8f8987e to e4b4991dddcd:/Users/wshel/.pyenv/versions/3.9.7/envs/dispatch/lib/python3.9/site-packages/alembic/runtime/migration.py:update_to_step:853
Success.

Migrated user:

[mvilanova]

LGTM