Remove redundant phpdocs for methods and variables

[ArjenMiedema]

As a developer I'd like to have the requirement for phpdoc for methods/variables in classes removed, so I don't have to add irrelevant doc blocks to my code.

Now that with the latest PHP versions it's possible to set return types and parameter types within the code, having them in the phpdoc as well is redundant and only adds noise. They should only be added if there is not just one type for these variables/methods or when more information is required in the phpdoc about the variable or method..

In the following situation, the doc blocks add nothing useful:

class Foobar extends BaseFoobar
{
    private FoobarVariable $foobarVariable;

    public function __construct(FoobarVariable $foobarVariable)
    {
        $this->foobarVariable = $foobarVariable;
    }

    public function someFunction(string $key, array $values): void
    {
        $foobarVariable = $this->foobarVariable;

        // PHP magic is done here
    }
}

Acceptance criteria

• Phpdocs are no longer mandatory in the coding standards

[leonhelmus]

@ArjenMiedema I believe this is resolved in the new testing suite