[CakePHPToSymfony] Add h function templates

[TomasVotruba]

Ref #2705

[afilina]

@TomasVotruba This rector doesn't actually work. $this->doTestFileWithoutAutoload($file); is a trick that makes the test pass, but there's no way to skip the require_once in a real run.

All templates are causing fatal errors. I tried to run CakePHPTemplateHToTwigRector on the exact same file as in the test:

<li>
    <?php echo $this->Html->link(__('List Rights'), ['action' => 'index']); ?>
</li>

and got this:

Fatal error: Uncaught Error: Call to a member function link() on null in ...

Demo: https://getrector.org/demo/31b1dd02-917e-4ac2-a8c5-0a60d41cb1f8#result

[TomasVotruba]

but there's no way to skip the require_once in a real run.

Apperantly it can work in tests... What would you suggest to make this work in Rector run itself?

[afilina]

I have no idea how it works deep down. I don't have any design documents and there's too much code to randomly go digging. We need the ability for a file to be the target of a rector without being force to require_once it.

[TomasVotruba]

Could add minimal failing test case to Github Actions?
I'll try to dig it out and make it work