Disabling of 'kdav-davitemfetchjob' test in KDav

[Ben Cooksley]

Hi everyone,

Currently we have an issue where the test 'kdav-davitemfetchjob' within
kdav causes kdeinit5 to be relaunched, as can be seen in the CI
run log below.

https://build.kde.org/job/Applications/job/kdav/job/kf5-qt5%20SUSEQt5.12/38/console

This is behaviour which is not permitted within the CI system, as the
newly spawned 'kdeinit5' processes are treated as being launched by
that test by CTest, meaning it will wait for eternity for them to exit
(which as resident daemon processes, they will not do without manual
intervention).

This in turn blocks the job from completing, and blocks CI resources
in the process.

I'd therefore like to propose disabling this test across all platforms
as it's behaviour is incompatible with the CI system.

Cheers,
Ben