tests: remove generated interop_test.js

Author: spytheman

.gitignore

@@ -137,6 +137,7 @@ Gtk-4.0.gir
 *.gir
 
 vlib/builtin/js/*.js
+vlib/v/tests/*.js
 
 # ignore the old regexp based v.ctags file (people using universal ctags < 6.1.0, can still benefit from them)
 .ctags.d/v.ctags