Take "Disabled" info into account

[pgiraud]

Is your feature request related to a problem? Please describe.

In PG18, if a node type is used even if the corresponding parameter to enable it is set to "off", a "Disabled" info now appear is the plan.

 postgres=# explain (settings) select * from t1 where c1+0<1000000;
                         QUERY PLAN
------------------------------------------------------------
 Seq Scan on t1  (cost=0.00..21370.00 rows=333333 width=22)
   Disabled: true
   Filter: ((c1 + 0) < 1000000)
 Settings: enable_seqscan = 'off'
(4 rows)

postgres=# explain (settings, format json) select * from t1 where c1+0<1000000;
               QUERY PLAN
----------------------------------------
 [
   {
     "Plan": {
       "Node Type": "Seq Scan",
       "Parallel Aware": false,
       "Async Capable": false,
       "Relation Name": "t1",
       "Alias": "t1",
       "Startup Cost": 0.00,
       "Total Cost": 21370.00,
       "Plan Rows": 333333,
       "Plan Width": 22,
       "Disabled": true,
       "Filter": "((c1 + 0) < 1000000)"
     },
     "Settings": {
       "enable_seqscan": "off"
     }
   }
 ]
(1 row) 

Describe the solution you'd like

This info could be made visible next to the node type.

[Krysztophe]

In big flashy red letters, please