Add duplicate table output for LOAD/UNLOAD PRIMARY KEY commands

SYSTEM LOAD PRIMARY KEY and SYSTEM UNLOAD PRIMARY KEY commands need
the table name to appear twice in EXPLAIN output, similar to
RELOAD DICTIONARY.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kyleconroy

parser/parser.go

@@ -7001,7 +7001,9 @@ func (p *Parser) parseSystem() *ast.SystemQuery {
 				strings.Contains(upperCmd, "DROP REPLICA") ||
 				strings.Contains(upperCmd, "RESTORE REPLICA") ||
 				strings.Contains(upperCmd, "STOP DISTRIBUTED SENDS") ||
-				strings.Contains(upperCmd, "START DISTRIBUTED SENDS") {
+				strings.Contains(upperCmd, "START DISTRIBUTED SENDS") ||
+				strings.Contains(upperCmd, "LOAD PRIMARY KEY") ||
+				strings.Contains(upperCmd, "UNLOAD PRIMARY KEY") {
 				sys.Database = tableName
 				sys.Table = tableName
 			} else {

parser/testdata/03202_system_load_primary_key/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt27": true
-  }
-}
+{}