[CI] Enable zend.assertions ini values in CI

[samsonasik]

To show error per fixture #55 (comment)

[samsonasik]

@TomasVotruba the isFirstClassCallable() seems already called on shouldSkip() method, so it works

rector-downgrade-php/rules/DowngradePhp70/Rector/Expression/DowngradeDefineArrayConstantRector.php

Lines 86 to 88 in 86a937c

	if ($funcCall->isFirstClassCallable()) {
	return true;
	}

however, the zend.assertions is needed to be set to 1 to show error early.

[samsonasik]

All checks have passed 🎉 @TomasVotruba I think it is ready, as per target rule already use $funcCall->isFirstClassCallable(), it doesn't show error.

[samsonasik]

@TomasVotruba I am merging it ;)

[TomasVotruba]

Thanks 👍