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[pyupgrade] Implement unnecessary-default-type-args (UP043) (#12371)

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## Summary

Add new rule and implement for `unnecessary default type arguments`
under the `UP` category (`UP043`).

```py
// < py313
Generator[int, None, None] 

// >= py313
Generator[int]
```

I think that as Python 3.13 develops, there might be more default type
arguments added besides `Generator` and `AsyncGenerator`. So, I made
this more flexible to accommodate future changes.

related issue: #12286

## Test Plan

snapshot included..!
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crates/ruff_linter/src/codes.rs
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@ -521,6 +521,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
(Pyupgrade, "040") => (RuleGroup::Stable, rules::pyupgrade::rules::NonPEP695TypeAlias),
(Pyupgrade, "041") => (RuleGroup::Stable, rules::pyupgrade::rules::TimeoutErrorAlias),
(Pyupgrade, "042") => (RuleGroup::Preview, rules::pyupgrade::rules::ReplaceStrEnum),
(Pyupgrade, "043") => (RuleGroup::Preview, rules::pyupgrade::rules::UnnecessaryDefaultTypeArgs),
// pydocstyle
(Pydocstyle, "100") => (RuleGroup::Stable, rules::pydocstyle::rules::UndocumentedPublicModule),