tests: don't run benchmarks for the tsan build

tests: don't run benchmarks for the tsan build

All we are really doing here is checking that TSAN builds compile and are
therefor a tool available to developers. The benchmarks are not
representative of QEMU's actual threading behaviour and they burn
precious CI time. Indeed switching to check-unit reveals many
unaddressed issues which have been logged at:

  https://gitlab.com/qemu-project/qemu/-/issues/1496

So for now disable the make check and make this a build only
test.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230228190653.1602033-8-alex.bennee@linaro.org>
(cherry picked from commit 7c7d369b33f01d3705a14c361689776de6bb5b7a)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>