Showing URL when opening browser

[juliobguedes]

What is the purpose of this pull request?

As requested in #1245, the goal of this PR is to display the URL that will be opened in the browser to allow the user to open it manually in case of errors.

What problem is this solving?

Some users using Unix distributions were not able to login using vtex login because the open and opn packages do not work properly in their OSs.

How should this be manually tested?

1. Add the .vtex/dev/bin folder to the PATH, as mentioned in the CONTRIBUTING file;
2. run yarn watch in the root folder of the repository
3. run vtex-test login
4. see the url

Screenshots or example usage

Types of changes

• Refactor (non-breaking change that only makes the code better)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Requires change to documentation, which has been updated accordingly.

Chores checklist

• Update CHANGELOG.md

[juliobguedes]

WIP: Still adding tests

[daniyelnnr]

LGTM, works fine here!

[silvadenisaraujo]

LGTM