Space separated lists are deprecated but this notice is not checked for.
extract_fields_from_arg_list also converts lists back to space-separated
lists causing a warning on get_scenario

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>

CONF_FILE, DTC_OVERLAY_FILE and OVERLAY_CONFIG are deprecated but still
used by the tests causing warnings when running them.

This adds a test_data specific to validate the emission of the warning,
and removes the offending args from the other test_data files.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>

Python 3.12 warns that

> Testing an element's truth value will raise an exception in future
> versions. Use specific 'len(elem)' or 'elem is not None' test instead.
>    if elem_ts := root.find('testsuite'):

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>

Adjusting the type hints and code accordingly.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>

This changes how some arguments are set in the `Handler`s.
`options`, `generator_cmd` and `suite_name_check` are now passed as
arguments to the constructor rather than injected from an other module.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>

Twister main expects an instance of TwisterEnv. Let's the linter know
about this.

Signed-off-by: Wilfried Chauveau <wilfried.chauveau@arm.com>