[flake8-type-checking] Disable TC006 & TC007 in stub files (#15179)

Fixes: #15176

## Summary

Neither of these rules make any sense in stub files. Technically TC007
should already not have triggered, due to the typing only context of the
binding, but it's better to be explicit.

Keeping TC008 enabled on the other hand makes sense to me, although we
could probably be more aggressive with unquoting in a typing runtime
context.

## Test Plan

`cargo nextest run`

crates/ruff_linter/src/checkers/ast/analyze/bindings.rs

@@ -77,7 +77,7 @@ pub(crate) fn bindings(checker: &mut Checker) {
                 checker.diagnostics.push(diagnostic);
             }
         }
-        if checker.enabled(Rule::UnquotedTypeAlias) {
+        if !checker.source_type.is_stub() && checker.enabled(Rule::UnquotedTypeAlias) {
             if let Some(diagnostics) =
                 flake8_type_checking::rules::unquoted_type_alias(checker, binding)
             {

crates/ruff_linter/src/checkers/ast/mod.rs

@@ -1282,7 +1282,7 @@ impl<'a> Visitor<'a> for Checker<'a> {
                         if let Some(arg) = args.next() {
                             self.visit_type_definition(arg);
 
-                            if self.enabled(Rule::RuntimeCastValue) {
+                            if !self.source_type.is_stub() && self.enabled(Rule::RuntimeCastValue) {
                                 flake8_type_checking::rules::runtime_cast_value(self, arg);
                             }
                         }