feat: Add group_size to guests_bookings

[zaydaanjahangir]

Pre-req migration for new filters on guest search backend

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 24.23%. Comparing base (1740e94) to head (d570116).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #217   +/-   ##
=======================================
  Coverage   24.23%   24.23%           
=======================================
  Files          37       37           
  Lines        1267     1267           
=======================================
  Hits          307      307           
  Misses        956      956           
  Partials        4        4           

Flag	Coverage Δ
backend	24.23% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.