Use finegrained .out ignoring in the output directory .gitignores

We already had a mostly up to date list in the directory specific
.gitignore files but the toplevel .gitignore contained a *.out
which took precedence (lower level files override higher level
files so removing *.out will allow for the src/test/regress/* files
to override the now removed .out file blocking). The reason for
not ignoring *.out is that we have quite a few tracked .out files
in the repository which we don't want to ignore changes to.

Also update the files to match the current set of tests since there
were a few missing.

.gitignore

@@ -49,6 +49,5 @@ build.sh
 
 # Added
 *.swp
-*.out
 
 VERSION

src/test/regress/expected/.gitignore

@@ -23,3 +23,9 @@ table_functions.out
 tidycat2.out
 tpch500GB.out
 partindex_test.out
+external_table.out
+table_functions_optimizer.out
+largeobject.out
+qp_gist_indexes2.out
+qp_gist_indexes2_optimizer.out
+qp_regexp.out

src/test/regress/sql/.gitignore

@@ -17,7 +17,6 @@ aocs.sql
 appendonly.sql
 bkup_bkupdb.sql
 mapred.sql
-ereport.sql
 tidycat.sql
 filespace.sql
 upgrade.sql
@@ -29,3 +28,6 @@ tidycat2.sql
 tpch500GB.sql
 partindex_test.sql
 external_table.sql
+largeobject.sql
+qp_gist_indexes2.sql
+qp_regexp.sql