Rollup merge of #81822 - Kixunil:path_try_exists, r=kennytm

Rollup merge of #81822 - Kixunil:path_try_exists, r=kennytm

Added `try_exists()` method to `std::path::Path`

This method is similar to the existing `exists()` method, except it
doesn't silently ignore the errors, leading to less error-prone code.

This change intentionally does NOT touch the documentation of `exists()`
nor recommend people to use this method while it's unstable.
Such changes are reserved for stabilization to prevent confusing people.

Apart from that it avoids conflicts with #80979.

`@joshtriplett` requested this PR in [internals discussion](https://internals.rust-lang.org/t/the-api-of-path-exists-encourages-broken-code/13817/25?u=kixunil)