We already have specs that demonstrate that `receive` works with a block:

https://github.com/rspec/rspec-mocks/blob/6770f2f4fb43f4c1133b7c78810afcb4256bbbf4/spec/rspec/mocks/matchers/receive_spec.rb#L27-L47

These specs just seem to duplicate those specs, especially given the fact that the `receive` matcher only forwards the block (or fails to do so), but isn't actually involved in invoking the block and passing the right args, for example.  Thoughts on removing these?