improve several tests in testament (#18635)

* silence error output from template_various.nim

* any => auto in tests

* avoid showing failed for parseSpec since this is expected behavior in 2 cases: tincludefile.nim, tnav1.nim

* enforce InheritFromException

* fixup

tests/generics/mdotlookup.nim

@@ -1,9 +1,9 @@
-proc baz(o: any): int = 5 # if bar is exported, it works
+proc baz(o: auto): int = 5 # if bar is exported, it works
 
 type MyObj = object
   x: int
 
-proc foo*(b: any) =
+proc foo*(b: auto) =
   var o: MyObj
   echo b.baz, " ", o.x.baz, " ", b.baz()