Replace mode by test and strict_clippy

tests/fixture/failure/info.toml

@@ -2,10 +2,9 @@ format_version = 1
 
 [[exercises]]
 name = "compFailure"
-mode = "run"
+test = false
 hint = ""
 
 [[exercises]]
 name = "testFailure"
-mode = "test"
 hint = "Hello!"

tests/fixture/state/info.toml

@@ -2,15 +2,14 @@ format_version = 1
 
 [[exercises]]
 name = "pending_exercise"
-mode = "run"
+test = false
 hint = """"""
 
 [[exercises]]
 name = "pending_test_exercise"
-mode = "test"
 hint = """"""
 
 [[exercises]]
 name = "finished_exercise"
-mode = "run"
+test = false
 hint = """"""

tests/fixture/success/info.toml

@@ -2,10 +2,9 @@ format_version = 1
 
 [[exercises]]
 name = "compSuccess"
-mode = "run"
+test = false
 hint = """"""
 
 [[exercises]]
 name = "testSuccess"
-mode = "test"
 hint = """"""