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/storage/unified/resource/transaction.go

@@ -0,0 +1,25 @@
+package resource
+
+import (
+	"context"
+	"database/sql"
+)
+
+type transactionContextKey struct{}
+
+// ContextWithTransaction returns a new context with the transaction stored directly.
+// This is used for SQLite migrations where the transaction needs to be shared
+// between the migration code and unified storage operations within the same process.
+func ContextWithTransaction(ctx context.Context, tx *sql.Tx) context.Context {
+	return context.WithValue(ctx, transactionContextKey{}, tx)
+}
+
+// TransactionFromContext retrieves the transaction from context
+func TransactionFromContext(ctx context.Context) *sql.Tx {
+	if v := ctx.Value(transactionContextKey{}); v != nil {
+		if tx, ok := v.(*sql.Tx); ok {
+			return tx
+		}
+	}
+	return nil
+}