chore: move test to run

Author: leodemoura

tests/lean/grind/grind_sym_prio.lean renamed to tests/lean/run/grind_sym_prio.lean

@@ -1,6 +1,8 @@
 opaque q : Nat → Prop
 opaque p : Nat → Prop
 
+attribute [grind symbol default] HAdd.hAdd
+
 /-- info: foo: [@HAdd.hAdd `[Nat] `[Nat] `[Nat] `[instHAdd] #6 #5] -/
 #guard_msgs (info) in
 @[grind? =>] theorem foo (x y : Nat) : x + y < 10 → q x → p x → p y → q y → x = y := by