[PHP] Enum must not be used as array key

### Apache NetBeans version

Apache NetBeans 16

### What happened

As of PHP 8.2, object must not be used as array key. Consequently enum must not be used as array key.

### How to reproduce

```php
10, // this statement must display error
Suit::Spades => 20, // this statement must display error
$cardA => 30, // this statement must display error
$cardB => 40, // this statement must display error
$cardA->value => 50, // OK
$cardB->value => 60, // OK
];
```

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Windows 10

### JDK

Java: 14.0.1; Java HotSpot(TM) 64-Bit Server VM 14.0.1+7 Runtime: Java(TM) SE Runtime Environment 14.0.1+7

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

_No response_

### Are you willing to submit a pull request?

No

### Code of Conduct

Yes

Start by running the supplied enum array-key example in Apache NetBeans 16's PHP editor and compare the editor's diagnostics with PHP 8.2 behavior. Locate the PHP code-analysis path that handles array keys; done means all four enum-as-key cases are reported as errors while the value-based keys remain accepted.

Written by the indexing model from the issue text.