Avoid accidentally wiping local database when running tests

[marcusmoore]

Description

This PR adds guards before the running of PHPUnit and Dusk tests that check to see if env files have been created to avoid falling back to the .env file and ending up with the local database being wiped.

For PHPUnit tests, if the user hasn't created a .env.testing file then the tests will not run.
For Dusk tests, a .env.dusk.local is required.

Type of change

• New feature (non-breaking change which adds functionality)

[what-the-diff]

PR Summary

• Modification of .chipperci.yml File
  This Pull Request adds a new line to the .chipperci.yml file to create a .env.testing file, improving the setup process of our testing environment.

• Update to DuskTestCase.php File
  This Pull Request introduces improvements to error handling. Now, the system will explicitly check if the required .env.dusk.local file is available. If not, a useful alert message will be triggered, preventing cryptic errors down the line.

• Improvements to TestCase.php File
  Similarly to the DuskTestCase.php update, this Pull Request adds a file existence check for .env.testing. This acts as a preventative measure, enabling clearer communication of issues if the necessary testing file is not present.

[snipe]

Love this, thank you!

[uberbrady]

Absolutely love this, thank you!