[BUG] Don't allow owner team with incorrect unit access

- On editting a team, only update the units if the team isn't the
'Owners' team. Otherwise the 'Owners' team end up having all of their
unit access modes set to 'None'; because the request form doesn't send
over any units, as it's simply not shown in the UI.
- Adds a database inconstency check and fix for the case where the
'Owners' team is affected by this bug.
- Adds unit test.
- Adds integration test.
- Resolves #5528
- Regression of https://github.com/go-gitea/gitea/pull/24012

services/doctor/dbconsistency.go

@@ -12,6 +12,7 @@ import (
 	"code.gitea.io/gitea/models/db"
 	issues_model "code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/models/migrations"
+	org_model "code.gitea.io/gitea/models/organization"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -177,6 +178,12 @@ func checkDBConsistency(ctx context.Context, logger log.Logger, autofix bool) er
 			Fixer:        auth_model.DeleteOrphanedOAuth2Applications,
 			FixedMessage: "Removed",
 		},
+		{
+			Name:         "Owner teams with no admin access",
+			Counter:      org_model.CountInconsistentOwnerTeams,
+			Fixer:        org_model.FixInconsistentOwnerTeams,
+			FixedMessage: "Fixed",
+		},
 	}
 
 	// TODO: function to recalc all counters