Add Visual Studio and VSCode files to .gitignore (#27132)

Summary:
These files are currently seen by Git if opening the project in Visual Studio or VSCode.

## Changelog
[Internal] [Fixed] - Add Visual Studio files to .gitignore
Pull Request resolved: https://github.com/facebook/react-native/pull/27132

Differential Revision: D18346486

Pulled By: cpojer

fbshipit-source-id: e1ff752790d46455e85b13f2508cd0286d6bdde2

.gitignore

@@ -89,3 +89,7 @@ RNTester/Pods/*
 # react-native-codegen
 /ReactCommon/fabric/components/rncore/
 /schema-rncore.json
+
+# Visual studio
+.vscode
+.vs