Delete tests.txt

docker/requirements/tests.txt

-asynctest
-cityscapesscripts
-codecov
-flake8
-imagecorruptions
-instaboostfast
-interrogate
-isort==4.3.21
-# Note: used for kwarray.group_items, this may be ported to mmcv in the future.
-kwarray
-memory_profiler
--e git+https://github.com/open-mmlab/mmtracking@dev-1.x#egg=mmtrack
-nltk
-onnx==1.7.0
-onnxruntime>=1.8.0
-parameterized
-prettytable
-protobuf<=3.20.1
-psutil
-pytest
-transformers
-ubelt
-xdoctest>=0.10.0
-yapf