Added prettier to fast-ssr package (#5617)

# Pull Request

## 📖 Description

<!---
Provide some background and a description of your work.
What problem does this change solve?
Is this a breaking change, chore, fix, feature, etc?
-->
This change adds prettier to the `@microsoft/fast-ssr` package.

Note: I ran prettier after the changes and it looks like the current files are gtg. This is more for future proofing.

## ✅ Checklist

### General

<!--- Review the list and put an x in the boxes that apply. -->

- [ ] 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](https://www.fast.design/docs/community/code-of-conduct/#our-standards) for this project.

packages/web-components/fast-ssr/.prettierignore

@@ -0,0 +1,3 @@
+coverage/*
+dist/*
+*.spec.ts

packages/web-components/fast-ssr/package.json

@@ -20,6 +20,8 @@
     "eslint": "eslint . --ext .ts",
     "eslint:fix": "eslint . --ext .ts --fix",
     "pretest": "npm run build-server && npm run build",
+    "prettier:diff": "prettier --config ../../../.prettierrc \"**/*.{ts,html}\" --list-different",
+    "prettier": "prettier --config ../../../.prettierrc --write \"**/*.{ts,html}\"",
     "test": "playwright test --config=playwright.config.cjs",
     "test-server": "node server/dist/server.js",
     "install-playwright-browsers": "npx playwright install"