slack-15.0: Add sql text counts stats to vtcombo,vtgate+`vttabl…

…et` (vitessio#15897)

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>
Signed-off-by: Harshit Gangal <harshit@planetscale.com>
Co-authored-by: Harshit Gangal <harshit@planetscale.com>
Co-authored-by: Deepthi Sigireddi <deepthi.sigireddi@gmail.com>

go/vt/vtgate/vtgate.go

@@ -306,7 +306,7 @@ func Init(
 			"Rows affected by a write (DML) operation through the VTgate API",
 			[]string{"Operation", "Keyspace", "DbType"}),
 		queryTextCharsProcessed: stats.NewCountersWithMultiLabels(
-			"VtgateSQLTextCounts",
+			"VtgateQueryTextCharactersProcessed",
 			"Vtgate API query SQL text counts",
 			[]string{"Operation", "Keyspace", "DbType"}),