Revert "Add the options method to action_controller testcase."

This reverts commit 0303c2325fab253adf5e4a0b738cb469c048f008.

Conflicts:
	actionpack/lib/action_controller/test_case.rb

REASON: It will conflict with a lot of test cases. Better to call
`process` directly since this is a very uncommon HTTP method.

Fixes #10638.