Move copyright rule to nursery (#5197)

## Summary

I want this to be explicitly opted-into.

crates/ruff/src/codes.rs

@@ -375,7 +375,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Flake8Simplify, "910") => (RuleGroup::Unspecified, rules::flake8_simplify::rules::DictGetWithNoneDefault),
 
         // copyright
-        (Copyright, "001") => (RuleGroup::Unspecified, rules::copyright::rules::MissingCopyrightNotice),
+        (Copyright, "001") => (RuleGroup::Nursery, rules::copyright::rules::MissingCopyrightNotice),
 
         // pyupgrade
         (Pyupgrade, "001") => (RuleGroup::Unspecified, rules::pyupgrade::rules::UselessMetaclassType),

ruff.schema.json

@@ -1720,8 +1720,6 @@
         "COM818",
         "COM819",
         "CPY",
-        "CPY0",
-        "CPY00",
         "CPY001",
         "D",
         "D1",