changelog: add new option --no-loadscope-reorder to maintain test order in loadscope

Author: darwintree

changelog/1083.improvement.rst

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+Add ``--no-loadscope-reorder`` option to disable automatic reordering of tests in loadscope for tests where relative ordering matters. This only applies when using ``loadscope``. 
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+For example, [test_file_1, test_file_2, ..., test_file_n] are given as input test files, if ``--no-loadscope-reorder`` is used, for either worker, the ``test_file_a`` will be executed before ``test_file_b`` only if ``a < b``.