Zend/tests: organize some tests with subdirectories (2) (#16423)

Move more low-hanging fruit, creating new directories for the tests for:

* comparisons
* dynamic calls
* err

Zend/tests: organize some tests with subdirectories (2) (#16423)

Move more low-hanging fruit, creating new directories for the tests for:

* comparisons
* dynamic calls
* error messages
* `error_reporting()`
* exceptions
* `foreach()`
* garbage collection
* group `use` statements
* heredoc and nowdoc
* `goto` jumps
* late static binding
* magic methods
* namespaces
* numeric literal separators
* objects
* `settype()`
* cleaning of temporary values
* `unset()`

Additionally, move some tests into the existing subdirectory for `list()`
tests.

Drive-by fixes of some test numbers in the names of the `goto` tests.

Work towards GH-15631

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