Parse and Format Yarn Install Output

[threeal]

This pull request resolves #150 by introducing the following changes:

• Modifies the yarnInstall function to run silently while outputting logs in JSON format, which can later be parsed and formatted in GitHub Actions log style.
• Introduces the YarnInstallOutput interface and the printYarnInstallOutput function to assist in parsing and formatting the Yarn install output.
• Adds and fixes testing accordingly.