Add a workaround for long tests crashing Android instrumentation

[bartekpacia]

This PR is aimed at #1725.

See also the previous (wrong) attempt: #1732

[bartekpacia]

Sample test that will still be failing

test('smoke test 4 (long group and test names)', () {
  // given
  final topLevelGroup = Group.root([
    LocalTest('patrol_test_explorer', Metadata.empty, () {}),
    Group(
      'example_test',
      [
        Group(
          'example_test myGroupWithLongName',
          [
            _localTest('example_test myGroupWithLongName alpha'),
          ],
        ),
      ],
    ),
  ]);

  // when
  final dartTestGroup = createDartTestGroup(
    topLevelGroup,
    maxTestCaseLength: 20,
  );

  // then
  expect(
    dartTestGroup,
    equals(
      DartGroupEntry(
        name: '',
        type: GroupEntryType.group,
        entries: [
          DartGroupEntry(
            name: 'example_test',
            type: GroupEntryType.group,
            entries: [
              DartGroupEntry(
                name: 'myGroup',
                type: GroupEntryType.group,
                entries: [
                  _testEntry(' '),
                ],
              ),
            ],
          ),
        ],
      ),
    ),
  );
});