Fix displaying outputs with add_*_script

#8259 induced a regression, causing Meson 0.57.0 and upward to
stop printing outputs of scripts added using `meson.add_*_script()`.
This makes _find_source_scripts() mark executables as verbose
in meson_exe.

mesonbuild/interpreter/mesonmain.py

@@ -102,7 +102,7 @@ class MesonMain(MesonInterpreterObject):
             largs.append(found)
 
         largs.extend(args)
-        es = self.interpreter.backend.get_executable_serialisation(largs)
+        es = self.interpreter.backend.get_executable_serialisation(largs, verbose=True)
         es.subproject = self.interpreter.subproject
         return es