IOS-3269 :: Feature internal :: configure step in the GitHub action to execute swift lint + swift format

[migueltorcha]

I have split the tasks in step by step commits, so you can discard or reorder any of them

Merge / Pull request information:

• Asana task link: https://app.asana.com/0/1201201287378530/1203054887613269

[migueltorcha]

It was failing due to the legacy_random commit. I've removed it. On the other hand, I'll mark this PR as draft, since it looks to be some inconsistencies between .swiftlint.yml and .swiftformat files.
Both tools are automatically fixing issues with their own commands:

• swiftlint lint --fix --format
• swiftformat .
  If you compare the commits where I apply those commands, you'll see that each tool is reformatting the code in it's own way. You'll need to make the applied rules compatibles. I did't try, but probably you can use this sample:

https://medium.com/glovo-engineering/linting-and-formatting-swift-code-in-our-apps-a49dc0a52332