[CodeStyle][F401] remove unused imports in unittests/dygraph_to_static,ir

[SigureMo]

PR types

Others

PR changes

Others

Describe

修复 python/paddle/fluid/tests/unittests/dygraph_to_static/ python/paddle/fluid/tests/unittests/ir/ 目录 F401(unused import) 存量

autoflake --in-place --remove-all-unused-imports --ignore-pass-after-docstring --exclude=__init__.py --recursive ./python/paddle/fluid/tests/unittests/dygraph_to_static/
autoflake --in-place --remove-all-unused-imports --ignore-pass-after-docstring --exclude=__init__.py --recursive ./python/paddle/fluid/tests/unittests/ir/

Related links

• Flake8 tracking issue: [CodeStyle] Flake8 tracking issue #46039
• F401 project: https://github.com/orgs/cattidea/projects/4/views/7
• 配置文件更新: [CodeStyle][F401] update flake8 F401 config (unittests/dygraph_to_static,ir,distributed_passes,tokenizer,sequence) #46794
• fixes [F401] python/paddle/fluid/tests/unittests/dygraph_to_static cattidea/paddle-flake8-project#36
• fixes [F401] python/paddle/fluid/tests/unittests/ir cattidea/paddle-flake8-project#27

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[raindrops2sea]

LGTM