release-23.1: sql/tests: fix test size of random syntax generation

Previously, the test size of the RSG tests within
the nightly environment was not configured correctly.
While the nightly script sets a timeout its overwritten
by the value from the bazel files. As a result the
TestRandomSyntaxFunction fails in CI environments when
run using the nightly scripts. To address this, this
patch bumps the test size to enormous.

Fixes: #109068

Release note: None

pkg/sql/tests/BUILD.bazel

@@ -32,7 +32,7 @@ go_library(
 
 go_test(
     name = "tests_test",
-    size = "large",
+    size = "enormous",
     srcs = [
         "allow_role_memberships_to_change_during_transaction_test.go",
         "autocommit_extended_protocol_test.go",