## Objective
Add a test that reproduces #11111 (and partially #18267). The bug is
that asset loader settings are effectively ignored if the same asset is
loaded multiple times with different settings.
## Solution
Add a unit test to `bevy_assets/lib.rs`. The test will be marked as
`#[ignore]` until #11111 is fixed.
```rust
// Load the same asset with different settings.
let handle_1 = load(asset_server, "test.u8", 1);
let handle_2 = load(asset_server, "test.u8", 2);
// Handles should be different.
assert_ne!(handle_1, handle_2);
```
## Concerns
I'm not 100% sure that the current behaviour is actually broken - I
can't see anything in the asset system design docs that explicitly says
different settings should create different asset ids.
UPDATE: Sentiment from issue comments and discord varies between "bug"
and "undesirable consequence of design decisions, alternatives should be
explored". So I've concluded that the test is valid and desirable.
## Testing
```sh
cargo test -p bevy_asset --features multi_threaded
# Or to repro the issue:
cargo test -p bevy_asset --features multi_threaded -- --ignored
```
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