filter_mode: change default from added to file

[Slamdunk]

Hi, I was hit hard by the default setting filder_mode: added: a developer of ours removed a line, the producion broke but the Github Action passed.

I propose here to have file as the default method: it's equally fast and doesn't miss such critical cases.

[Slamdunk]

Any feedback @haya14busa ?

[grische]

I have encountered the same problem, someone deleting the initialization of a variable, breaking all references later in the script.
For now, I manually added filter_mode: file to all action-shellcheck everywhere, but it would be great to have it as a default.

@Slamdunk There seem to be some conflicts with your PR.

[Slamdunk]

@grische thank you for the notice, PR was ok when I opened it 2 months ago.

Maybe @shogo82148 can review and merge this 🤞

[shogo82148]

Thanks!

[review-dog]

Hi, @Slamdunk! We merged your PR to reviewdog! 🐶
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