Create Experiments troubleshooting guide for Support

[john-thomas-dotcms]

We need to provide a guide to Support on how to troubleshoot Experiments. This should not duplicate what's already in our docs; it should just cover additional info Support may need that customers won't. It should include:

• An overview of the Analytics Infrastructure
• A list of common failure modes and what the cause is. For example:
  • Experiments shows as not enabled: Check the Analytics App config
  • The Experiment is running, but not data is being collected:
    • Ensure that there's enough data for the chart and table to show (e.g. minimum 10 sessions and at least one successful and unsuccessful conversion for each variant)
    • View the results of the CubeJS call to see if any data was returned
    • etc.
  • Visitors don't seem to be routed to the variants
  • etc.
• How to get help from R&D if they have questions or need help (e.g., post a message in the #falcon-heavy channel, or DM the PM or team lead directly)

[github-actions[bot]]

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