It is useful if `--debug` generates review message via GitHub Workflow command

[oakcask]

Currently --debug generates TOML like this:

$ git whose '*' --debug 
[[".github/dependabot.yml"]]
line = 1
rule = "* foo"
owners = ["foo"]
effective = false
[[".github/dependabot.yml"]]
line = 2
rule = ".github/ bar"
owners = ["bar"]
effective = true

It is useful if git-whose generate warning on line 1 which is not effective rule in CODEOWNERS in CI.

$ git whose '*' --github-review
::warning file=CODEOWNERS,line=1::The rule matches `.github/dependabot.yml` but is overridden by line 2"

https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-a-warning-message