runner: Introduce --prune-mode to igt_runner

Allow finer control of reporting dynamic subtests instead of
unconditionally assuming that the main subtest result and logs are
uninteresting if the subtest has dynamic subtests.

The default is still to remove subtest results when the subtest has
dynamic subtests. Other options are:

keep-subtests: Remove the dynamic subtests instead, for cases when a
stable test count is more important.

keep-all: Remove nothing.

keep-requested: Remove the results that were not directly requested to
be executed. This option is useful in cases where the test selection
is a hand-picked mix of subtests and particular dynamic subtests.

Signed-off-by: Petri Latvala <petri.latvala@intel.com>
Cc: Arkadiusz Hiler <arek@hiler.eu>
Reviewed-by: Swati Sharma <swati2.sharma@intel.com>

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