Workflow (run-tests) - Use of ParaTest, Composer Caching, Fix Stability Matrix Clash

[lrljoe]

Three files modified:

1. Fix for ColumnsSelectedTest.php class being named ColumnSelectedTest instead of ColumnsSelectedTest

2. New Composer require-dev for ParaTest rather than straight PHPUnit, which allows for parallel running of PHPUnit tests up to the maximum threads that the CPU is capable of.

3. Workflow actions major changes:
   a) Introduces use of ParaTest rather than PHPUnit to allow for parallel processing of tests
   b) Re-introduces Laravel 8 to the matrix
   c) Introduces use of Composer Caching to avoid repeated downloads of requirements when running actions. This is a cache per-matrix instance, which expires when the hash of the composer.lock changes.
   d) Removes the clash between the matrix line for stability, and what was enforced prefer-dist.

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests and did you add any new tests needed for your feature?
2. Did you update all templates (if applicable)?
3. Did you add the relevant documentation (if applicable)?
4. Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[lrljoe]

@rappasoft - it'd be good if you can check this one out, as it does make running the tests around 400% faster. Very straight forward.
Perhaps use this version on push and the other on pull-request, until you're comfortable?

[rappasoft]

Everything seems to pass 👍

[lrljoe]

Awesome, if you then run the workflow again by doing a push without impacting your composer.json/lock then you should see the steps in the workflow not do a proper "download" it should just say "locking" instead when doing composer update, and ParaTest should work more quickly locally too.