Tests for cursor variables

[jemgillam]

Description

Some test files for using variables when defining cursors 👍

Performance impact

Security impact

Checklist

• My code matches the project's code style and yarn lint:fix passes.
• I've added tests for the new feature, and yarn test passes.
• I have detailed the new feature in the relevant documentation.
• I have added this feature to 'Pending' in the RELEASE_NOTES.md file (if one exists).
• If this is a breaking change I've explained why.

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Latest commit: 8df3cc6

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[benjie]

Looks good! I think you missed the transform on one file, and I've added a few more variable references in the last test just to be even more thorough, please fix and re-run the tests and then we can get this merged - thanks!