[CI] Fix CI (#2029)

* [CI] Fix CI

* fix wrong command

* remove mmcv

* fix lint error

* add pytorch install

* fix pytorch installation

* fix mmengine error

* fix mmcv installation in pr_stage

* fix docstring coverage in lint and delete cu102 in pr_stage windows

* fix lint.yml and reset test.yml

* ignore some ut in build_windows of pr_stage

* test merge stage test

* fix mmseg dependencies in pr_stage_test.yml

* delete redundant lines in pr_stage and fix mmseg dependencies in mr_stage

* fix error in merge_stage

* delete python -m in merge_stage

* fix error in merge_stage

* let mmcv installation before mmengine

* fix error of mmcv not found

* fix ut error in merge)stage_test.yml

* fix build_windows ut in metge_stage

* fix error

* fix windows error of merge_stag

* Update .github/workflows/merge_stage_test.yml

* Update .github/workflows/merge_stage_test.yml

* Update .github/workflows/merge_stage_test.yml

* fix error

* delete skip timm ut

* add requitements/optinal.txt in test.yml

* Update .github/workflows/merge_stage_test.yml

Co-authored-by: Miao Zheng <76149310+MeowZheng@users.noreply.github.com>