Add a basic test infrastructure

[regularfry]

Description

This PR adds make tasks for running tests.

Context

This issue says that we're out of alignment with wider policy in the sense that we're applying stricter rules than government policy requires.

There are two ways to solve this: we can either loosen our rules, or make them easier to comply with. From the point of view of the test statuses we require in the quality framework here, this does the latter.

Specifically it allows the user of the template to put scripts into scripts/test for running the various types of test required by the software-engineering-quality-framework which, until they are implemented, will output a warning to the console (but do not fail).

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[stefaniuk]

@regularfry This PR establishes a very clean and easy-to-follow pattern. It would be good to get it merged. I've made some comments and suggestions for changes to ensure it matches the existing style of writing. Thank you!

[stefaniuk]

LGTM