[pyupgrade] Remove non-pep604-isinstance (UP038) (#19156)

## Summary
This PR Removes deprecated UP038 as per instructed in #18727 
closes #18727 
## Test Plan
I have run tests non of them failing 

One Question i have is do we have to document that UP038 is removed?

---------

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>

crates/ruff_linter/src/codes.rs

@@ -563,7 +563,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Pyupgrade, "035") => (RuleGroup::Stable, rules::pyupgrade::rules::DeprecatedImport),
         (Pyupgrade, "036") => (RuleGroup::Stable, rules::pyupgrade::rules::OutdatedVersionBlock),
         (Pyupgrade, "037") => (RuleGroup::Stable, rules::pyupgrade::rules::QuotedAnnotation),
-        (Pyupgrade, "038") => (RuleGroup::Deprecated, rules::pyupgrade::rules::NonPEP604Isinstance),
+        (Pyupgrade, "038") => (RuleGroup::Removed, rules::pyupgrade::rules::NonPEP604Isinstance),
         (Pyupgrade, "039") => (RuleGroup::Stable, rules::pyupgrade::rules::UnnecessaryClassParentheses),
         (Pyupgrade, "040") => (RuleGroup::Stable, rules::pyupgrade::rules::NonPEP695TypeAlias),
         (Pyupgrade, "041") => (RuleGroup::Stable, rules::pyupgrade::rules::TimeoutErrorAlias),

crates/ruff_linter/src/rules/pyupgrade/rules/use_pep604_isinstance.rs

@@ -33,8 +33,8 @@ impl CallKind {
     }
 }
 
-/// ## Deprecation
-/// This rule was deprecated as using [PEP 604] syntax in `isinstance` and `issubclass` calls
+/// ## Removed
+/// This rule was removed as using [PEP 604] syntax in `isinstance` and `issubclass` calls
 /// isn't recommended practice, and it incorrectly suggests that other typing syntaxes like [PEP 695]
 /// would be supported by `isinstance` and `issubclass`. Using the [PEP 604] syntax
 /// is also slightly slower.

python/py-fuzzer/pyproject.toml

@@ -62,9 +62,6 @@ ignore = [
     # These are enforced by, or incompatible with, the ruff formatter:
     "E203",
     "E501",
-    # Makes code slower and more verbose
-    # https://github.com/astral-sh/ruff/issues/7871
-    "UP038",
 ]
 unfixable = [
     "F841",   # unused variable. ruff keeps the call, but mostly it's best to get rid of it all

ruff.schema.json

@@ -4306,7 +4306,6 @@
         "UP035",
         "UP036",
         "UP037",
-        "UP038",
         "UP039",
         "UP04",
         "UP040",