Move tests to mypy/incremental/ticket_6435

diff --git a/test/ext/mypy/files/__init__.py b/test/ext/mypy/incremental/ticket_6435/__init__.py
similarity index 100%
rename from test/ext/mypy/files/__init__.py
rename to test/ext/mypy/incremental/ticket_6435/__init__.py

diff --git a/test/ext/mypy/files/enum_col_import1.py b/test/ext/mypy/incremental/ticket_6435/enum_col_import1.py
similarity index 100%
rename from test/ext/mypy/files/enum_col_import1.py
rename to test/ext/mypy/incremental/ticket_6435/enum_col_import1.py

diff --git a/test/ext/mypy/files/enum_col_import2.py b/test/ext/mypy/incremental/ticket_6435/enum_col_import2.py
similarity index 100%
rename from test/ext/mypy/files/enum_col_import2.py
rename to test/ext/mypy/incremental/ticket_6435/enum_col_import2.py