[v11.0.x] MySQL: snapshot tests (#86184)

MySQL: snapshot tests (#84846)

mysql: add snapshot tests
(cherry picked from commit 3b7ee3a56b)

Co-authored-by: Gábor Farkas <gabor.farkas@gmail.com>

pkg/tsdb/mysql/testdata/time_series/no_rows_wide.sql

@@ -0,0 +1,10 @@
+-- SELECT * FROM tbl WHERE false
+CREATE TABLE tbl (
+    `time` timestamp NOT NULL,
+    v1 double precision,
+    v2 double precision
+);
+
+INSERT INTO tbl (`time`, v1, v2) VALUES
+('2023-12-24 14:30:03+00:00', 10, 110),
+('2023-12-24 14:31:03+00:00', 20, 120);