luacheck: exclude test-run tests

Running of luacheck against test-run submodule is redundant.
Add dedicated bypass to .luacheckrc.

NO_DOC=ci
NO_CHANGELOG=ci
NO_TEST=ci

(cherry picked from commit 8d6a154f)

.luacheckrc

@@ -30,9 +30,7 @@ include_files = {
 
 exclude_files = {
     "build/**/*.lua",
-    "test-run/test/test-tarantool/*.test.lua",
-    "test-run/lib/checks/*",
-    "test-run/lib/luatest/*",
+    "test-run/**/*.lua",
     "test/app/*.test.lua",
     "test/box/*.test.lua",
     "test/engine/*.test.lua",