Improve linting speed in github actions

[pushrbx]

Recently with #431 we changed the linting process to run on all files, because it does give you a completely different output when you specify a list of files. We'd like to improve this and make it only run on changed files. Not only that, it should run through grumphp if possible, because that one has special rules too.

[github-actions]

This issue will be closed and archived in 18 days, as there has been no activity in the last 60 days. If this issue is still relevant or you would like to see it actioned, please respond and we will re-open this issue.

[github-actions]

This issue will be closed and archived in 18 days, as there has been no activity in the last 60 days. If this issue is still relevant or you would like to see it actioned, please respond and we will re-open this issue.

[github-actions]

This issue will be closed and archived in 18 days, as there has been no activity in the last 60 days. If this issue is still relevant or you would like to see it actioned, please respond and we will re-open this issue.