t/t2021-checkout-last: "checkout -" should work after a rebase finishes

  $ git checkout -

does not work as expected after a rebase.  This is because the
reflog records "checkout" made by "rebase" as its implementation
detail the same way as end-user initiated "checkout", and makes it
count as the branch that was previously checked out.

Add four failing tests documenting this bug: two for a normal rebase,
and another two for an interactive rebase.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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