Replace .map_or(false, $closure) with .is_some_and(closure) (#6244)

**Summary**
[Option::is_some_and](https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.is_some_and)
and
[Result::is_ok_and](https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok_and)
are new methods is rust 1.70. I find them way more readable than
`.map_or(false, ...)`.

The changes are `s/.map_or(false,/.is_some_and(/g`, then manually
switching to `is_ok_and` where the value is a Result rather than an
Option.

**Test Plan** n/a^

crates/ruff_python_stdlib/src/identifiers.rs

@@ -5,10 +5,7 @@ use crate::keyword::is_keyword;
 pub fn is_identifier(name: &str) -> bool {
     // Is the first character a letter or underscore?
     let mut chars = name.chars();
-    if !chars
-        .next()
-        .map_or(false, |c| c.is_alphabetic() || c == '_')
-    {
+    if !chars.next().is_some_and(|c| c.is_alphabetic() || c == '_') {
         return false;
     }
 
@@ -41,7 +38,7 @@ pub fn is_module_name(name: &str) -> bool {
     let mut chars = name.chars();
     if !chars
         .next()
-        .map_or(false, |c| c.is_ascii_lowercase() || c == '_')
+        .is_some_and(|c| c.is_ascii_lowercase() || c == '_')
     {
         return false;
     }

crates/ruff_python_stdlib/src/path.rs

@@ -3,23 +3,23 @@ use std::path::Path;
 /// Return `true` if the [`Path`] appears to be that of a Python file.
 pub fn is_python_file(path: &Path) -> bool {
     path.extension()
-        .map_or(false, |ext| ext == "py" || ext == "pyi")
+        .is_some_and(|ext| ext == "py" || ext == "pyi")
 }
 
 /// Return `true` if the [`Path`] is named `pyproject.toml`.
 pub fn is_project_toml(path: &Path) -> bool {
     path.file_name()
-        .map_or(false, |name| name == "pyproject.toml")
+        .is_some_and(|name| name == "pyproject.toml")
 }
 
 /// Return `true` if the [`Path`] appears to be that of a Python interface definition file (`.pyi`).
 pub fn is_python_stub_file(path: &Path) -> bool {
-    path.extension().map_or(false, |ext| ext == "pyi")
+    path.extension().is_some_and(|ext| ext == "pyi")
 }
 
 /// Return `true` if the [`Path`] appears to be that of a Jupyter notebook (`.ipynb`).
 pub fn is_jupyter_notebook(path: &Path) -> bool {
-    path.extension().map_or(false, |ext| ext == "ipynb")
+    path.extension().is_some_and(|ext| ext == "ipynb")
 }
 
 #[cfg(test)]