Skip TestConnQuerySanitizeSQLWithDollarQuotesStrings on CockroachDB

The test creates a canary table inside a transaction and relies on
rollback to remove it. CockroachDB auto commits DDL, so the table
survives the rollback and every subsequent run of the suite fails with
"relation canary already exists". Skip it there, matching the other DDL
in transaction tests.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: jackc

query_test.go

@@ -2256,6 +2256,7 @@ func TestQueryWithProcedureParametersInAndOut(t *testing.T) {
 
 func TestConnQuerySanitizeSQLWithDollarQuotesStrings(t *testing.T) {
 	t.Parallel()
+	skipCockroachDB(t, "CockroachDB auto commits DDL by default")
 
 	conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
 	defer closeConn(t, conn)