testsuite: add new test for desugar warnings/errors with -fno-code

Add a new (expect_broken) test T10600 that checks that the error:
Top-level bindings for unlifted types aren't allowed: is thrown when
compiling with -fno-code. This test currently fails because modules
compiled with -fno-code aren't desugared. There are several other errors
which can be thrown during desugaring that aren't tested for,
discoverable by grepping for "errDs".

Update .stderr files T8101 and T8101b. Presumably the compilation output
has changed slightly since they were written.

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: rwbarton, thomie

GHC Trac Issues: #10600, #8101

Differential Revision: https://phabricator.haskell.org/D3533

(cherry picked from commit c326665c3742bb97904f7096689d40246ce6397f)