Implement shallow-copy-environ / W1507 (#14241)

<!--
Thank you for contributing to Ruff! To help us out with reviewing,
please consider the following:

- Does this pull request include a summary of the change? (See below.)
- Does this pull request include a descriptive title?
- Does this pull request include references to any relevant issues?
-->

## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

Related to #970. Implement [`shallow-copy-environ /
W1507`](https://pylint.readthedocs.io/en/stable/user_guide/messages/warning/shallow-copy-environ.html).

## Test Plan

<!-- How was it tested? -->

Unit test

---------

Co-authored-by: Simon Brugman <sbrugman@users.noreply.github.com>
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

crates/ruff_python_semantic/src/model.rs

@@ -1266,6 +1266,7 @@ impl<'a> SemanticModel<'a> {
             "anyio" => self.seen.insert(Modules::ANYIO),
             "builtins" => self.seen.insert(Modules::BUILTINS),
             "collections" => self.seen.insert(Modules::COLLECTIONS),
+            "copy" => self.seen.insert(Modules::COPY),
             "contextvars" => self.seen.insert(Modules::CONTEXTVARS),
             "dataclasses" => self.seen.insert(Modules::DATACLASSES),
             "datetime" => self.seen.insert(Modules::DATETIME),
@@ -1856,6 +1857,7 @@ bitflags! {
         const CONTEXTVARS = 1 << 19;
         const ANYIO = 1 << 20;
         const FASTAPI = 1 << 21;
+        const COPY = 1 << 22;
     }
 }