Update usage information metrics for v2026.1

[matthew-white]

Metrics to add

• Login customization in use
  • Is there a logo?
  • Is there a hero image?
  • Is there a title?
  • Is there a description?
• Entity list deletion
  • Number of audit log events
• Entity property deletion
  • Number of audit log events

Metrics to remove

• (None yet)

Checklist

• Update the form version string in the Backend config.
• Publish the new form version on data.getodk.cloud.
• Update the usage report in Frontend.