Zend/*: fix a bunch of typos (GH-16017)

* Zend/*: fix a bunch of typos

* Zend/tests/try/try_catch_finally_005.phpt: update string length

[skip ci] Use _exit for type inference verification

Otherwise we get useless leak warnings when building with asan.

Add runtime type inference verification

Co-authored-by: Dmitry Stogov <dmitry@zend.com>

Closes GH-12930