Remove personal preference settings in vscode settings file and deprecated eslint.packageManager setting (#6959)

# Pull Request

## 📖 Description

Changes:
- Remove personal preference settings in the .vscode settings file
- Remove duplicates of VS Code defaults
- Remove deprecated `eslint.packageManager` setting

## 👩‍💻 Reviewer Notes

The impetus for this change was the lack of word wrap in markdown makes editing markdown difficult. A little house-keeping was also done, see the above list.

## ✅ Checklist

### General

- [ ] I have included a change request file using `$ yarn change`
- [ ] I have added tests for my changes.
- [x] I have tested my changes.
- [ ] I have updated the project documentation to reflect my changes.
- [x] I have read the [CONTRIBUTING](https://github.com/microsoft/fast/blob/master/CONTRIBUTING.md) documentation and followed the [standards](/docs/community/code-of-conduct/#our-standards) for this project.

Author: janechu

.vscode/settings.json

@@ -4,12 +4,8 @@
   },
   "[markdown]": {
     "editor.quickSuggestions": {
-      "comments": "off",
-      "strings": "off",
       "other": "off"
     },
-    "editor.wordWrap": "off",
-    "editor.wordWrapColumn": 90,
     "files.insertFinalNewline": false,
     "files.trimTrailingWhitespace": false
   },
@@ -19,7 +15,6 @@
   "editor.trimAutoWhitespace": true,
   "eslint.codeActionsOnSave.mode": "problems",
   "eslint.lintTask.enable": true,
-  "eslint.packageManager": "yarn",
   "eslint.validate": [
     "typescript"
   ],