Script/lint: Changed default from 'all' to 'changed'

[cdce8p]

Description:

Changed the default behavior of script/lint. Instead of checking all files on execution, only the changed ones will be tested for lint errors. Testing all files is still possible with flag --all or the call itself: tox -e lint.

Response to: #12651

[emlove]

I'm 👍 on this, but we should get a few opinions.

We should make sure to get a docs PR open as well. At least the Testing your code page needs to be updated, but it's probably worth a quick grep as well in the repo.

[kellerza]

I like it!

(originally added --changed 👍 )

[cdce8p]

Just read through the doc. It was already described to just check changed files. Maybe we could even remove the --all flag, since running tox -e lint would take nearly the same time which is also described in the first section.

[kellerza]

https://home-assistant.io/developers/development_testing/ clearly shows the --cleared flag... but this will still work with this version, better to update the docs as well though.

[emlove]

I'd be fine just dropping --all as well myself. Most everywhere else we instruct devs to just use tox directly.

[cdce8p]

@kellerza I already opened a PR for it: home-assistant/home-assistant.io/pull/4753