SQLStore: Run tests as integration tests (#28265)

* sqlstore: Run tests as integration tests

* Truncate database instead of re-creating it on each test

* Fix test description

See https://github.com/grafana/grafana/pull/12129

* Fix lint issues

* Fix postgres dialect after review suggestion

* Rename and document functions after review suggestion

* Add periods

* Fix auto-increment value for mysql dialect

Co-authored-by: Emil Tullstedt <emil.tullstedt@grafana.com>
(cherry picked from commit 4937f0daab)

pkg/services/sqlstore/migrator/dialect.go

@@ -45,6 +45,7 @@ type Dialect interface {
 	PostInsertId(table string, sess *xorm.Session) error
 
 	CleanDB() error
+	TruncateDBTables() error
 	NoOpSql() string
 
 	IsUniqueConstraintViolation(err error) bool
@@ -270,3 +271,7 @@ func (db *BaseDialect) CleanDB() error {
 func (db *BaseDialect) NoOpSql() string {
 	return "SELECT 0;"
 }
+
+func (db *BaseDialect) TruncateDBTables() error {
+	return nil
+}