Move PG version check to awx-manage check_db & migrate commands

[AlanCoding]

SUMMARY

Similar to #15338, this is an action I very strongly want to get out of the __init__.py for management commands, which basically runs for every single thing we run.

The consequences of having it there go further than just performance. It causes us to open up a connection unexpectedly, whereas otherwise we wouldn't have. I saw this back when we were trying to improve our connection management, but changing, by nature, is opinionated.

By doing this, we would be shifting the burden to installers of AWX to assure that, if an external database is used, it must meet the minimum version. That can be done by:

• running awx-manage check_db, which is not unreasonable, since installers already have to run a ton of management commands
• just checking the database version with their own logic

Because this is asking some of installers, I expect it will be more difficult to get in than 15338, which is why I'm keeping it separate.

ISSUE TYPE

• Bug, Docs Fix or other nominal change

COMPONENT NAME

• API

[AlanCoding]

I might change my feelings here, and try the pre_migrate signal instead. So we won't require installer changes.

[AlanCoding]

I think the updated approach here is solid. Marking ready for review.

[AlanCoding]

demos:

bash-5.1$ awx-manage migrate
Operations to perform:
  Apply all migrations: auth, conf, contenttypes, dab_rbac, dab_resource_registry, main, oauth2_provider, sessions, sites, social_django, sso
CommandError: At a minimum, postgres version 18 is required, found 15

(forced a bit)

(awx) alancoding@Sourdough:~/repos/awx$ awx-manage migrate
Operations to perform:
  Apply all migrations: auth, conf, contenttypes, dab_rbac, dab_resource_registry, main, oauth2_provider, sessions, sites, social_django, sso
CommandError: Running server with 'sqlite' type database is not supported

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud