Make `array::{try_from_fn, try_map}` and `Iterator::try_find` generic over `Try`
Fixes #85115
This only updates unstable functions.
`array::try_map` didn't actually exist before; this adds it under the still-open tracking issue #79711 from the old PR #79713.
Tracking issue for the new trait: #91285
This would also solve the return type question in for the proposed `Iterator::try_reduce` in #87054
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| .. | ||
| alloc | ||
| backtrace@b02ed04a7e | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@cfba59fccd | ||
| test | ||
| unwind | ||