Fix SQL syntax highlighting in VS Code for SQL tests

[seancolsen]

As discussed in our DB-layer meeting.

Checklist

• [x] My pull request has a descriptive title (not a vague title like Update index.md).
• [x] My pull request targets the develop branch of the repository
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• [x] I added tests for the changes I made (if applicable).
• [x] I added or updated documentation (if applicable).
• [x] I tried running the project locally and verified that there are no visible errors.

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Developer Certificate of Origin

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[mathemancer]

I think it's appropriate to merge this into develop (as you set up) and then merge that into the architectural_overhaul branch.