fix: sqllogictest runner label condition mismatch (#16633)

* fix sqllogictest condition mismatch

* Update test file condition

* revert changes in sqllogictests

---------

Co-authored-by: Leon Lin <lliangyu@amazon.com>

Author: lliangyu-lin

datafusion/sqllogictest/test_files/pg_compat/pg_compat_null.slt

@@ -48,7 +48,7 @@ COPY aggregate_test_100_by_sql
 ###
 ## Setup test for datafusion
 ###
-onlyif DataFusion
+skipif postgres
 statement ok
 CREATE EXTERNAL TABLE aggregate_test_100_by_sql (
   c1  VARCHAR NOT NULL,

datafusion/sqllogictest/test_files/pg_compat/pg_compat_simple.slt

@@ -49,7 +49,7 @@ COPY aggregate_test_100_by_sql
 ###
 ## Setup test for datafusion
 ###
-onlyif DataFusion
+skipif postgres
 statement ok
 CREATE EXTERNAL TABLE aggregate_test_100_by_sql (
   c1  VARCHAR NOT NULL,

datafusion/sqllogictest/test_files/pg_compat/pg_compat_union.slt

@@ -46,7 +46,7 @@ COPY aggregate_test_100_by_sql
 ###
 ## Setup test for datafusion
 ###
-onlyif DataFusion
+skipif postgres
 statement ok
 CREATE EXTERNAL TABLE aggregate_test_100_by_sql (
   c1  VARCHAR NOT NULL,

datafusion/sqllogictest/test_files/pg_compat/pg_compat_window.slt

@@ -46,7 +46,7 @@ COPY aggregate_test_100_by_sql
 ###
 ## Setup test for datafusion
 ###
-onlyif DataFusion
+skipif postgres
 statement ok
 CREATE EXTERNAL TABLE aggregate_test_100_by_sql (
   c1  VARCHAR NOT NULL,