GH-16067: prevent invalid `abstract` during compilation of methods (GH-16069)

For classes that are not declared `abstract`, produce a compiler error for any
`abstract` methods. For anony

GH-16067: prevent invalid `abstract` during compilation of methods (GH-16069)

For classes that are not declared `abstract`, produce a compiler error for any
`abstract` methods. For anonymous classes, since they cannot be made abstract,
the error message is slightly different.

Co-authored-by: Ilija Tovilo <ilija.tovilo@me.com>

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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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