gitlab: disable FF_SCRIPT_SECTIONS on msys jobs

gitlab: disable FF_SCRIPT_SECTIONS on msys jobs

The FF_SCRIPT_SECTIONS=1 variable should ordinarily cause output from
each line of the job script to be presented in a collapsible section
with execution time listed.

While it works on Linux shared runners, when used with Windows runners
with PowerShell, this option does not create any sections, and actually
causes echo'ing of commands to be disabled, making it even worse to
debug the jobs.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230801130403.164060-9-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>