Set explicit testcase.timeout for slow tests

Set explicit testcase.timeout for slow tests

We'd like to decrease the default timeout for tests in the Qt Project CI
so that we waste less time waiting for hanging tests.

Tests which genuinely take a long time to run, such as these, should
have their timeout explicitly set in their .pro file.

Change-Id: I4fe6249e9efa764b230251d73a1115c24411e168
Reviewed-by: Toby Tomkins <toby.tomkins@nokia.com>
Reviewed-by: Kalle Lehtonen <kalle.ju.lehtonen@nokia.com>