scripts: ci: test_plan: add parameter for no of testcase roots

class Filters:

    def __init__(self, modified_files, ignore_path, alt_tags, testsuite_root,

                 pull_request=False, platforms=[], detailed_test_id=True):

                 pull_request=False, platforms=[], detailed_test_id=True, tc_roots_th=20):

        self.modified_files = modified_files

        self.testsuite_root = testsuite_root

        self.resolved_files = []

        self.detailed_test_id = detailed_test_id

        self.ignore_path = ignore_path

        self.tag_cfg_file = alt_tags

        self.tc_roots_th = tc_roots_th

    def process(self):

        self.find_modules()

        for t in tests:

            _options.extend(["-T", t ])

        if len(tests) > 20:

        if len(tests) > self.tc_roots_th:

            logging.warning(f"{len(tests)} tests changed, this looks like a global change, skipping test handling, revert to default")

            self.full_twister = True

            return

            help="Number of tests per builder")

    parser.add_argument('-n', '--default-matrix', default=10, type=int,

            help="Number of tests per builder")

    parser.add_argument('--testcase-roots-threshold', default=20, type=int,

            help="Threshold value for number of modified testcase roots, up to which an optimized scope is still applied."

                 "When exceeded, full scope will be triggered")

    parser.add_argument('--detailed-test-id', action='store_true',

            help="Include paths to tests' locations in tests' names.")

    parser.add_argument("--no-detailed-test-id", dest='detailed_test_id', action="store_false",

        print("=========")

    f = Filters(files, args.ignore_path, args.alt_tags, args.testsuite_root,

                args.pull_request, args.platform, args.detailed_test_id)

                args.pull_request, args.platform, args.detailed_test_id,

                args.testcase_roots_threshold)

    f.process()

    # remove dupes and filtered cases