Code improvements and version updates

[patrickdappollonio]

This PR:

• Uses testify/assert to reduce the number of lines written in tests and increase yours truly's proficiency 🤣
• Upgrades several stuff like:
  • Dependencies (moved back to Cobra now that the package doesn't add additional dependencies; updated GHA versions)
  • Sort order (now includes IngressClass)
  • Goreleaser (now there's a name_template that's deprecated that is no longer in use)
• The number of empty whitespaces before, between and after a file has been removed to make it more predictable
  • While I consider this a small change since the behaviour of the YAML code doesn't change here, I would request people to provide a review on this
• Unit tests with fixtures for the core program
  • I plan to expand this further so any drop-in file can be unit-tested.