fix(unified): in-proc SQLite data migration (#114537)

* feat: unified storage migrations integration tests

* chore: add comment and adjust db path name

* chore: refactor test cases into interface

* fix: unified SQLite migration with SQLStore migrator

* revert changes to newResourceDBProvider

pkg/util/xorm/session.go

@@ -7,6 +7,7 @@ package xorm
 import (
 	"context"
 	"database/sql"
+	"errors"
 	"fmt"
 	"hash/crc32"
 	"reflect"
@@ -43,7 +44,7 @@ type Session struct {
 	afterProcessors []executedProcessor
 
 	prepareStmt bool
-	stmtCache   map[uint32]*core.Stmt //key: hash.Hash32 of (queryStr, len(queryStr))
+	stmtCache   map[uint32]*core.Stmt // key: hash.Hash32 of (queryStr, len(queryStr))
 
 	// !evalphobia! stored the last executed query on this session
 	lastSQL     string
@@ -236,6 +237,14 @@ func (session *Session) DB() *core.DB {
 	return session.db
 }
 
+// Tx returns the underlying transaction
+func (session *Session) Tx() (*core.Tx, error) {
+	if session.tx == nil {
+		return nil, errors.New("no open transaction")
+	}
+	return session.tx, nil
+}
+
 func cleanupProcessorsClosures(slices *[]func(any)) {
 	if len(*slices) > 0 {
 		*slices = make([]func(any), 0)