chore(experiment): relocate funnel statistical methods

[jurajmajerik]

Problem

The statistical methods in funnel_experiment_results need to be accessible to both the old and new implementations.

Changes

There are no functional changes, only some restructuring:

• Moved these methods to a new location and imported them into:
  • trend_experiment_results (old implementation)
  • experiment_funnel_query_runner (new implementation)
• Moved the experiment query runner and related files to a separate folder
• Split the old Trend and Funnel test methods into separate files

How did you test this code?

Existing tests pass

[github-actions]

Size Change: 0 B

Total Size: 2.06 MB

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Filename	Size
frontend/dist/toolbar.js	2.06 MB

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