Spanner-related fixes (#102376)

* Fix UNION syntax in resourcepermissions package.
* Fix migrations in usermig package to work with Spanner.
* Fix health query.
* Use more connections for integration tests.
* Add test-go-integration-spanner target to run integration tests against Spanner emulator.
* Add test for enterprise.
* Don't delete sequence number for migration_log.id column.

* Only bump max open connections to 20 for Spanner.
Lower integration test timeout.

pkg/services/sqlstore/migrations/usermig/service_account_multiple_org_login_migrator.go

@@ -72,6 +72,20 @@ func (p *ServiceAccountsSameLoginCrossOrgs) Exec(sess *xorm.Session, mg *migrato
               AND is_service_account = 1
               AND login NOT LIKE 'sa-' || CAST(org_id AS TEXT) || '-%';
         `)
+	case migrator.Spanner:
+		_, err = p.sess.Exec(`
+            UPDATE user
+            SET login = CONCAT('sa-', CAST(org_id AS STRING), '-',
+                CASE
+                    WHEN login LIKE 'sa-%' THEN SUBSTRING(login, 4)
+                    ELSE login
+                END
+            )
+            WHERE login IS NOT NULL
+              AND is_service_account
+              AND login NOT LIKE CONCAT('sa-', CAST(org_id AS STRING), '-%')
+        `)
+
 	default:
 		return fmt.Errorf("dialect not supported: %s", p.dialect)
 	}
@@ -128,6 +142,19 @@ func (p *ServiceAccountsDeduplicateOrgInLogin) Exec(sess *xorm.Session, mg *migr
                     WHERE u2.login = 'sa-' || CAST(u.org_id AS TEXT) || SUBSTRING(u.login, LENGTH('sa-'||CAST(u.org_id AS TEXT)||'-'||CAST(u.org_id AS TEXT))+1)
                 );;
         `)
+	case migrator.Spanner:
+		_, err = sess.Exec(`
+            UPDATE ` + dialect.Quote("user") + ` AS u
+            SET login = 'sa-' || CAST(u.org_id AS STRING) || SUBSTRING(u.login, LENGTH('sa-'||CAST(u.org_id AS STRING)||'-'||CAST(u.org_id AS STRING))+1)
+            WHERE u.login IS NOT NULL
+                AND u.is_service_account
+                AND u.login LIKE 'sa-'||CAST(u.org_id AS STRING)||'-'||CAST(u.org_id AS STRING)||'-%'
+                AND NOT EXISTS (
+                    SELECT 1
+                    FROM  ` + dialect.Quote("user") + `AS u2
+                    WHERE u2.login = 'sa-' || CAST(u.org_id AS STRING) || SUBSTRING(u.login, LENGTH('sa-'||CAST(u.org_id AS STRING)||'-'||CAST(u.org_id AS STRING))+1)
+                );;
+        `)
 	default:
 		return fmt.Errorf("dialect not supported: %s", dialect)
 	}

pkg/services/sqlstore/migrations/usermig/user_lowercase_login_and_email.go

@@ -30,7 +30,7 @@ func (p *UsersLowerCaseLoginAndEmail) SQL(dialect migrator.Dialect) string {
 func (p *UsersLowerCaseLoginAndEmail) Exec(sess *xorm.Session, mg *migrator.Migrator) error {
 	// Get all users
 	users := make([]*user.User, 0)
-	err := sess.Table("user").Find(&users)
+	err := sess.Table("user").Asc("created").Find(&users)
 	if err != nil {
 		return err
 	}

pkg/services/sqlstore/migrator/spanner_dialect.go

@@ -147,6 +147,9 @@ func (s *SpannerDialect) TruncateDBTables(engine *xorm.Engine) error {
 		switch table.Name {
 		case "":
 			continue
+		case "autoincrement_sequences":
+			// Don't delete sequence number for migration_log.id column.
+			statements = append(statements, fmt.Sprintf("DELETE FROM %v WHERE name <> 'migration_log:id'", s.Quote(table.Name)))
 		case "migration_log":
 			continue
 		case "dashboard_acl":