* made '_ignored' check if the given file is already ignored by the root .gitignore. Added corresponding functional test
* code formatting
* Changed method input, adjusted tests, formatted code
* typo
* tests: use git logger fix in conftest
See https://github.com/iterative/dvc/issues/3167
* scm: git: remove redundant comments
Co-authored-by: Ruslan Kuprieiev <[email protected]>