Bugfix: support Array as parent in associateDestroyableChild

[ef4]

The included test throws an assertion without the accompanying bugfix.

The issue here is that the DestroyableMeta is trying to be clever about avoiding extra allocations, so it uses the OneOrMany type a lot. But this means it cannot accurately distinguish between the case where your parent is an array vs the case where you have multiple parents.

My fix adds a Symbol to the internally-created array that represents multiple parents so it's distinguishable from a single parent that happens to be an array.

[github-actions]

	This PR	main
Dev	600K └─┬ . 169K ├── runtime 160K ├── syntax 100K ├── compiler 58K ├── opcode-compiler 36K ├── validator 27K ├── manager 11K ├── program 8.9K ├── reference 7.5K ├── destroyable 6.3K ├── util 4.3K ├── node 3.4K ├── global-context 2.5K ├── wire-format 1.0K ├── vm 969B ├── encoder 844B ├── vm-babel-plugins 606B └── owner	600K └─┬ . 169K ├── runtime 160K ├── syntax 100K ├── compiler 58K ├── opcode-compiler 36K ├── validator 27K ├── manager 11K ├── program 8.9K ├── reference 7.2K ├── destroyable 6.3K ├── util 4.3K ├── node 3.4K ├── global-context 2.5K ├── wire-format 1.0K ├── vm 969B ├── encoder 844B ├── vm-babel-plugins 606B └── owner
Prod	236K └─┬ . 70K ├── syntax 63K ├── runtime 48K ├── compiler 18K ├── opcode-compiler 9.8K ├── validator 7.9K ├── manager 4.8K ├── program 3.6K ├── reference 2.4K ├── util 2.1K ├── node 1.6K ├── wire-format 1.6K ├── destroyable 737B ├── vm 594B ├── global-context 516B ├── encoder 469B ├── vm-babel-plugins 155B └── owner	236K └─┬ . 70K ├── syntax 63K ├── runtime 48K ├── compiler 18K ├── opcode-compiler 9.8K ├── validator 7.9K ├── manager 4.8K ├── program 3.6K ├── reference 2.4K ├── util 2.1K ├── node 1.6K ├── wire-format 1.5K ├── destroyable 737B ├── vm 594B ├── global-context 516B ├── encoder 469B ├── vm-babel-plugins 155B └── owner

[ef4]

@NullVoxPopuli thanks, I was wondering how to make the performance CI run.

[NullVoxPopuli]

We'll need #1772 first 🙈

Silly deprecation means non-working forever thing 🫠

[NullVoxPopuli]

https://github.com/glimmerjs/glimmer-vm/actions/runs/17483617066/job/49658813526#step:6:552

Oof bit rot