Auto merge of #11865 - yuxqiu:map_unwrap_or_default, r=Jarcho

feat: add `manual_is_variant_and` lint

changelog: add a new lint [`manual_is_variant_and`].
- Replace `option.map(f).unwrap_or_default()` and `result.map(f).unwrap_or_default()` with `option.is_some_and(f)` and `result.is_ok_and(f)` where `f` is a function or closure that returns `bool`.
- MSRV is set to 1.70.0 for this lint; when `is_some_and` and `is_ok_and` was stabilised

---

For example, for the following code:

```rust
let opt = Some(0);
opt.map(|x| x > 1).unwrap_or_default();
```

It suggests to instead write:

```rust
let opt = Some(0);
opt.is_some_and(|x| x > 1)
```

0 files changed, 0 insertions, 0 deletions