Split tests to separate files

[webtonize]

Story

As a developer I prefer multiple smaller files over 1 big one to prevent merge conflicts when adding tests for new functions.

Acceptance Criteria

• Split function test files to cover the same structure as the function files for the module.
• Split rules test files to cover the same structure as the rules files.
• No significant increase in amount of calls the Azure DevOps REST API`
• No significant increase in overall test duration
• No decrease in code coverage based on the module's Functions directory