fix: resolve Node 18 build issue with covid-data-monitor

[greatislander]

• This pull request has been linted by running npm run lint without errors
• This pull request has been tested by running npm run start and reviewing affected routes
• This pull request has been built by running npm run build without errors
• This isn't a duplicate of an existing pull request

Description

fs-extra is used in the inclusive-design/covid-data-monitor build script, but it's not a dependency, but rather a devDependency of covid-data-monitor. This means that the builds fail on Node 18, I think because of the way dependencies of dependencies are handled. This PR adds a (minimal) fix by running npm install fs-extra within the covid-data-monitor dependency before trying to build it.

Steps to test

1. npm ci
2. npm run build

Expected behavior: Build succeeds.

Additional information

Not applicable.

Related issues

Not applicable.

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