Fix trailing space diff in gporca.out

This must have been a typo committed in commit 6b79a578 . The
original commit missed a trailing space in the output file after a newly
added comment (which causes a regress diff when optimizer=off) I was
going to fix it by adding the trailing space back, but on a second
thought, I decided to gut the comment from all 3 files (one .sql and two
.out files) to prevent future self-loathing.

While we were at it, also remove the ever-expanding list of DROP
statements that are ignored from the end of gporca.out. Honestly the
`DROP` itself kinda offends me, but that's for another day. Let's get
the build green for now.

src/test/regress/expected/gporca.out

@@ -11393,4 +11393,3 @@ SELECT * FROM varchar_sc_array_cmp t1, varchar_sc_array_cmp t2 where t1.a = t2.a
 (3 rows)
 
 DROP TABLE varchar_sc_array_cmp;
---

src/test/regress/expected/gporca_optimizer.out

@@ -11535,102 +11535,3 @@ SELECT * FROM varchar_sc_array_cmp t1, varchar_sc_array_cmp t2 where t1.a = t2.a
 (3 rows)
 
 DROP TABLE varchar_sc_array_cmp;
--- 
--- start_ignore
-DROP SCHEMA orca CASCADE;
-NOTICE:  drop cascades to 92 other objects
-DETAIL:  drop cascades to table bar1
-drop cascades to table bar2
-drop cascades to table r
-drop cascades to table s
-drop cascades to table m
-drop cascades to table m1
-drop cascades to table rcte
-drop cascades to table onek
-drop cascades to table pp
-drop cascades to table multilevel_p
-drop cascades to table t
-drop cascades to table t_date
-drop cascades to table t_text
-drop cascades to type employee
-drop cascades to function emp_equal(employee,employee)
-drop cascades to operator =(employee,employee)
-drop cascades to operator family employee_op_class for access method btree
-drop cascades to table t_employee
-drop cascades to table t_ceeval_ints
-drop cascades to function csq_f(integer)
-drop cascades to table csq_r
-drop cascades to table fooh1
-drop cascades to table fooh2
-drop cascades to append only table t77
-drop cascades to table prod9
-drop cascades to table toanalyze
-drop cascades to table ur
-drop cascades to table us
-drop cascades to table ut
-drop cascades to table uu
-drop cascades to table twf1
-drop cascades to table twf2
-drop cascades to table tab1
-drop cascades to table tab2
-drop cascades to function sum_sfunc(anyelement,anyelement)
-drop cascades to function sum_combinefunc(anyelement,anyelement)
-drop cascades to function myagg1(anyelement)
-drop cascades to function sum_sfunc2(anyelement,anyelement,anyelement)
-drop cascades to function myagg2(anyelement,anyelement)
-drop cascades to function gptfp(anyarray,anyelement)
-drop cascades to function gpffp(anyarray)
-drop cascades to function myagg3(anyelement)
-drop cascades to table array_table
-drop cascades to table mpp22453
-drop cascades to table mpp22791
-drop cascades to table p1
-drop cascades to append only table tmp_verd_s_pp_provtabs_agt_0015_extract1
-drop cascades to table arrtest
-drop cascades to table foo_missing_stats
-drop cascades to table bar_missing_stats
-drop cascades to table cust
-drop cascades to table datedim
-drop cascades to table sales
-drop cascades to function plusone(integer)
-drop cascades to table bm_test
-drop cascades to table bm_dyn_test
-drop cascades to table bm_dyn_test_onepart
-drop cascades to table my_tt_agg_opt
-drop cascades to table my_tq_agg_opt_part
-drop cascades to function plusone(numeric)
-drop cascades to table ggg
-drop cascades to table t3
-drop cascades to table index_test
-drop cascades to table btree_test
-drop cascades to table bitmap_test
-drop cascades to type rainbow
-drop cascades to table foo
-drop cascades to table foo_ctas
-drop cascades to table input_tab1
-drop cascades to table input_tab2
-drop cascades to table tab_1
-drop cascades to table tab_2
-drop cascades to table tab_3
-drop cascades to table t_outer
-drop cascades to table t_inner
-drop cascades to table test1
-drop cascades to table t_new
-drop cascades to table x_tab
-drop cascades to table y_tab
-drop cascades to table z_tab
-drop cascades to function test_func_pg_stats()
-drop cascades to table bar
-drop cascades to type myint
-drop cascades to function myintout(myint)
-drop cascades to function myintin(cstring)
-drop cascades to function myint_int8(myint)
-drop cascades to table csq_cast_param_outer
-drop cascades to table csq_cast_param_inner
-drop cascades to function myint_numeric(myint)
-drop cascades to cast from myint to numeric
-drop cascades to table onetimefilter1
-drop cascades to table onetimefilter2
-drop cascades to table ffoo
-drop cascades to table fbar
--- end_ignore

src/test/regress/sql/gporca.sql

@@ -2193,7 +2193,6 @@ SET optimizer_array_constraints=on;
 EXPLAIN SELECT * FROM varchar_sc_array_cmp t1, varchar_sc_array_cmp t2 where t1.a = t2.a and (t1.a in ('b', 'c') OR t1.a = 'a');
 SELECT * FROM varchar_sc_array_cmp t1, varchar_sc_array_cmp t2 where t1.a = t2.a and (t1.a in ('b', 'c') OR t1.a = 'a');
 DROP TABLE varchar_sc_array_cmp;
--- 
 
 -- start_ignore
 DROP SCHEMA orca CASCADE;