Feature/use new snapshots

[darylldoyle]

Description of the Change

This PR updates the local docker system to utilise the new Snapshots WP-CLI command rather than the prior docker-based WP Snapshots system.

This has the following benefits:

• Removes the need for a dedicated snapshots container.
• Removes the issue with WP Snapshots running on PHP 8+ codebases
• Makes Snapshots more extensible

Closes #332 #316 #305

How to test the Change

• Clone the repo and checkout this branch.
• Open the directory in a terminal
• Build the codebase
  • nvm use
  • npm run build
• Create a new environment and do the following within it
  • Ensure the new WP-CLI command is working
  • npm run 10updocker wp snapshots search <something>
  • Ensure the old command is proxying to the new WP-CLI command
  • npm run 10updocker wpsnapshots search <something>
  • npm run 10updocker snapshots search <something>
• Update an existing environment to ensure the phpfpm container can access the required directories (see below)
  • Ensure the new WP-CLI command is working
  • npm run 10updocker wp snapshots search <something>
  • Ensure the old command is proxying to the new WP-CLI command
  • npm run 10updocker wpsnapshots search <something>
  • npm run 10updocker snapshots search <something>

  phpfpm:
      image: '10up/wp-php-fpm-dev:7.4-ubuntu'
      # ...
      volumes:
         # ...
          - '~/.wpsnapshots:/home/www-data/.wpsnapshots:cached'
          - '~/.aws:/home/www-data/.aws:cached'

Changelog Entry

Changed - Snapshots are now using the Snapshots WP-CLI command

Credits

Props @tlovett1, @darylldoyle

Checklist:

• [x] I agree to follow this project's Code of Conduct.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [ ] All new and existing tests pass.