tests/intel-ci: Drop few core tests from XE BAT

Regession with "6.9.0-rc1-xe" is preventing to run KMS tests
in BAT. Hence drop "xe_exec_threads" & "xe_evict" from XE BAT
until we fix the regression.

V2:
 - Drop xe_evict tests

Issue: drm/xe/kernel#1044


Signed-off-by: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
Acked-by: Kamil Konieczny <kamil.konieczny@linux.intel.com>