Use db.Find instead of writing methods for every object (#28084)

For those simple objects, it's unnecessary to write the find and count
methods again and again.

tests/integration/auth_ldap_test.go

@@ -414,7 +414,7 @@ func TestLDAPGroupTeamSyncAddMember(t *testing.T) {
 		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{
 			Name: gitLDAPUser.UserName,
 		})
-		usersOrgs, err := organization.FindOrgs(db.DefaultContext, organization.FindOrgOptions{
+		usersOrgs, err := db.Find[organization.Organization](db.DefaultContext, organization.FindOrgOptions{
 			UserID:         user.ID,
 			IncludePrivate: true,
 		})

tests/integration/org_count_test.go

@@ -118,7 +118,7 @@ func doCheckOrgCounts(username string, orgCounts map[string]int, strict bool, ca
 			Name: username,
 		})
 
-		orgs, err := organization.FindOrgs(db.DefaultContext, organization.FindOrgOptions{
+		orgs, err := db.Find[organization.Organization](db.DefaultContext, organization.FindOrgOptions{
 			UserID:         user.ID,
 			IncludePrivate: true,
 		})