Remove SQL regression tests for GUCs related to NO_SHOW_ALL

No GUCs that use NO_SHOW_ALL are reported in pg_show_all_settings(),
hence trying to check combinations of flags related to it is pointless.

These queries have been introduced by d10e41d, so backpatch down to 15
to keep all the branches consistent.  Equivalent checks based on
NO_SHOW_ALL could be added in check_GUC_init() when a GUC is initially
loaded, but this can be done only on HEAD.

Author: Nitin Jadhav
Discussion: https://postgr.es/m/CAMm1aWaYe0muu3ABo7iSAgK+OWDS9yNe8GGRYnCyeEpScYKa+g@mail.gmail.com
Backpatch-through: 15

src/test/regress/expected/guc.out

@@ -841,7 +841,6 @@ CREATE TABLE tab_settings_flags AS SELECT name, category,
     'EXPLAIN'          = ANY(flags) AS explain,
     'NO_RESET'         = ANY(flags) AS no_reset,
     'NO_RESET_ALL'     = ANY(flags) AS no_reset_all,
-    'NO_SHOW_ALL'      = ANY(flags) AS no_show_all,
     'NOT_IN_SAMPLE'    = ANY(flags) AS not_in_sample,
     'RUNTIME_COMPUTED' = ANY(flags) AS runtime_computed
   FROM pg_show_all_settings() AS psas,
@@ -880,33 +879,6 @@ SELECT name FROM tab_settings_flags
 ------
 (0 rows)
 
--- NO_SHOW_ALL implies NO_RESET_ALL, and vice-versa.
-SELECT name FROM tab_settings_flags
-  WHERE no_show_all AND NOT no_reset_all
-  ORDER BY 1;
- name 
-------
-(0 rows)
-
--- Exceptions are transaction_*.
-SELECT name FROM tab_settings_flags
-  WHERE NOT no_show_all AND no_reset_all
-  ORDER BY 1;
-          name          
-------------------------
- transaction_deferrable
- transaction_isolation
- transaction_read_only
-(3 rows)
-
--- NO_SHOW_ALL implies NOT_IN_SAMPLE.
-SELECT name FROM tab_settings_flags
-  WHERE no_show_all AND NOT not_in_sample
-  ORDER BY 1;
- name 
-------
-(0 rows)
-
 -- NO_RESET implies NO_RESET_ALL.
 SELECT name FROM tab_settings_flags
   WHERE no_reset AND NOT no_reset_all

src/test/regress/sql/guc.sql

@@ -326,7 +326,6 @@ CREATE TABLE tab_settings_flags AS SELECT name, category,
     'EXPLAIN'          = ANY(flags) AS explain,
     'NO_RESET'         = ANY(flags) AS no_reset,
     'NO_RESET_ALL'     = ANY(flags) AS no_reset_all,
-    'NO_SHOW_ALL'      = ANY(flags) AS no_show_all,
     'NOT_IN_SAMPLE'    = ANY(flags) AS not_in_sample,
     'RUNTIME_COMPUTED' = ANY(flags) AS runtime_computed
   FROM pg_show_all_settings() AS psas,
@@ -349,18 +348,6 @@ SELECT name FROM tab_settings_flags
 SELECT name FROM tab_settings_flags
   WHERE category = 'Preset Options' AND NOT not_in_sample
   ORDER BY 1;
--- NO_SHOW_ALL implies NO_RESET_ALL, and vice-versa.
-SELECT name FROM tab_settings_flags
-  WHERE no_show_all AND NOT no_reset_all
-  ORDER BY 1;
--- Exceptions are transaction_*.
-SELECT name FROM tab_settings_flags
-  WHERE NOT no_show_all AND no_reset_all
-  ORDER BY 1;
--- NO_SHOW_ALL implies NOT_IN_SAMPLE.
-SELECT name FROM tab_settings_flags
-  WHERE no_show_all AND NOT not_in_sample
-  ORDER BY 1;
 -- NO_RESET implies NO_RESET_ALL.
 SELECT name FROM tab_settings_flags
   WHERE no_reset AND NOT no_reset_all