Silence log messages from the capybara server

[elia]

Description

Puma is taken as the default rack server, but until rspec/rspec-rails#1897 is solved we should stick to the proposed workaround.

The typical output goes like this:

$ cd frontend; bundle exec rspec ; cd -

Randomized with seed 63849
..........Capybara starting Puma...
* Version 4.3.1 , codename: Mysterious Traveller
* Min threads: 0, max threads: 4
* Listening on tcp://127.0.0.1:59724
.................................................................................................................................................................................................................

Finished in 1 minute 33.28 seconds (files took 5.71 seconds to load)
219 examples, 0 failures

Randomized with seed 63849

Checklist:

• I have followed Pull Request guidelines
• I have added a detailed description into each commit message
• I have updated Guides and README accordingly to this change (if needed)
• I have added tests to cover this change (if needed)
• I have attached screenshots to this PR for visual changes (if needed)

[spaghetticode]

@elia thank you 👍

[DanielePalombo]

👍

[kennyadsl]

Thanks, @elia!