PG18 - Adjust EXPLAIN's output for disabled nodes (#8108)

fixes #8097

src/test/regress/bin/normalize.sed

@@ -328,3 +328,14 @@ s/\| CHECK ([a-zA-Z])(.*)/| CHECK \(\1\2\)/g
 
 # pg18 change: strip trailing “.00” (or “.0…”) from actual rows counts
 s/(actual rows=[0-9]+)\.[0-9]+/\1/g
+
+# pg18 “Disabled” change start
+# ignore any “Disabled:” lines in test output
+/^\s*Disabled:/d
+
+# ignore any JSON-style Disabled field
+/^\s*"Disabled":/d
+
+# ignore XML <Disabled>true</Disabled> or <Disabled>false</Disabled>
+/^\s*<Disabled>.*<\/Disabled>/d
+# pg18 “Disabled” change end