[BUG] Server Side Rendering fails when using Gatsby

A pull request for this has already been merged.

• #1096 by @aaronpowell — merged
• #1167 by @MSNev — merged

**Description/Screenshot**

I'm using [Gatsby](https://gatsbyjs.org) to create a static website but when I attempted to generate the static HTML files from the React components the Server Side Rendering (SSR) fails in AppInsights:

```
"window" is not available during server side rendering.
[14/1691]
See our docs page for more info on this error: https://gatsby.dev/debug-html

ReferenceError: window is not defined

- render-page.js:8451 new AjaxMonitor
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:8451:34

- render-page.js:10514 new Initialization
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:10514:29

- render-page.js:50798 Module../src/AppInsights.js
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:50798:306

- render-page.js:30 __webpack_require__
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:30:30

- render-page.js:51172 Module../src/components/ProductSummary/index.js
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:51172:70

- render-page.js:30 __webpack_require__
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:30:30

- render-page.js:51433 Module../src/templates/ProductPage.js
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:51433:84

- render-page.js:30 __webpack_require__
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:30:30

- render-page.js:667 Object../.cache/sync-requires.js
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:667:364

- render-page.js:30 __webpack_require__
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:30:30

- render-page.js:617 Module../.cache/static-entry.js
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:617:1526

- render-page.js:30 __webpack_require__
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:30:30

- render-page.js:94
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:94:18

- render-page.js:97
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:97:10

- render-page.js:3 webpackUniversalModuleDefinition
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:3:20

- render-page.js:10 Object.
/home/aaron/code/github/react-app-insights/AppInsights-Part2/public/render-page.js:10:3
```

**Steps to Reproduce**

1. Create a new Gatsby website (using the default starter kit, or any others)
2. Add AppInsights from npm + the React extension
3. Run `npm run build` to generate the static output

- OS/Browser: WSL2 (but confirmed failing on Windows)
- SDK Version [e.g. 22]:
```
"@microsoft/applicationinsights-react-js": "^2.3.0",
"@microsoft/applicationinsights-web": "^2.3.0",
```
- How you initialized the SDK: Following [Basic Usage](https://github.com/microsoft/ApplicationInsights-JS/blob/17ef50442f73fd02a758fbd74134933d92607ecf/extensions/applicationinsights-react-js/README.md#basic-usage) from the sample README.

**Expected behavior**

Gatsby is able to generate a set of static files.

**Additional context**

You'll find a demo that the errors can be repo'ed in [on my GitHub](https://github.com/aaronpowell/react-app-insights/tree/11fb80613f7ce9f75e8af55e72c829661d72664d/AppInsights-Part1). Gatsby works fine when run using the development webserver.

Start by reproducing the failure with a Gatsby starter, the AppInsights.js initialization shown in the stack trace, and the Basic Usage setup, then run npm run build. Check the SSR path where render-page.js reports window is unavailable. Done means Gatsby generates the static files without the SSR error; linked pull requests indicate this work has already moved forward.

Written by the indexing model from the issue text.