Remove added group around base type in AttributedTypeSyntax

Causes quite a few changes in eg. sourcekit-lsp, so presumably will in
other codebases as well. Ideally we'd add this behind some new
versioning in the config.

As an example of a change this causes:
```
private let logMessageToIndexLog:
  @sendable (
    _ message: String, _ type: WindowMessageType, _ structure: LanguageServerProtocol.StructuredLogKind
  ) -> Void
```

To:
```
@sendable
  (
    _ message: String, _ type: WindowMessageType, _ structure: LanguageServerProtocol.StructuredLogKind
  ) -> Void
```

Author: bnbarham

Sources/SwiftFormat/PrettyPrint/TokenStreamCreator.swift

@@ -2411,9 +2411,6 @@ private final class TokenStreamCreator: SyntaxVisitor {
       )
     }
 
-    before(node.baseType.firstToken(viewMode: .sourceAccurate), tokens: .open)
-    after(node.baseType.lastToken(viewMode: .sourceAccurate), tokens: .close)
-
     after(node.lastToken(viewMode: .sourceAccurate), tokens: .close)
     return .visitChildren
   }

Tests/SwiftFormatTests/PrettyPrint/FunctionTypeTests.swift

@@ -316,15 +316,15 @@ final class FunctionTypeTests: PrettyPrintTestCase {
       expected: """
         func f(
           _ body:
-            nonisolated(nonsending)
-            () async -> Void
+            nonisolated(nonsending) ()
+            async -> Void
         ) {}
 
         func f(
           _ body:
             @Foo @Bar
-            nonisolated(nonsending)
-            () async -> Void
+            nonisolated(nonsending) ()
+            async -> Void
         ) {}
 
         func f(
@@ -336,8 +336,8 @@ final class FunctionTypeTests: PrettyPrintTestCase {
         func f(
           _ body:
             inout @Foo @Bar
-            nonisolated(nonsending)
-            () async -> Void
+            nonisolated(nonsending) ()
+            async -> Void
         ) {}
 
         """,