add new GA4 tag and remove unsupported tag manager

[BoDonkey]

Summary

Summarize the changes briefly, including which issue/ticket this resolves. If it closes an existing Github issue, include "Closes #[issue number]" This PR adds the new GA4 tag to the documentation site and removes the old tag. It also removes the plugin for adding a Google analytic tag to the site, as it does not support the new GA4 tags. Closes OS-134.

What are the specific steps to test this change?

For example:

1. Run the website and log in as an admin
2. Open a piece manager modal and select several pieces
3. Click the "Archive" button on the top left of the manager and confirm that it should proceed
4. Check that all pieces have been archived properly

1. Build the documentation.
2. Open the DevTools and look for the second Google Analytic tags manager script. It should have a value of "G-t!M7W6BWMD"

What kind of change does this PR introduce?

(Check at least one)

• [ ] Bug fix
• [ ] New feature
• [ ] Refactor
• [ ] Documentation
• [ ] Build-related changes
• [X] Other

Make sure the PR fulfills these requirements:

• [X] It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• [ ] The changelog is updated
• [ ] Related documentation has been updated
• [ ] Related tests have been updated

If adding a new feature without an already open issue, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[linear[bot]]

OS-134 GA4 Analytics Tag for A3 Docs Site

In order not to lose our analytics for the A3 Docs site once Google sunsets the current Analytics account, we need to add the new GA4 Analytics Tag. Below is the information populated by the installation wizard through the analytics account. **Install the Google tag manually** Below is the Google tag for this account. Copy and paste it in the code of every page of your website, immediately after the element. Don’t add more than one Google tag to each page. ](https://www.googletagmanager.com/gtag/js?id=G-T1M7W6BWMD">) CC @bob - noting that this may not be as straight forward as it was for the marketing site, as the Docs site is on a Vue platform.