[Bugfix] Contact merge ids data type

[fivetran-avinash]

PR Overview

Package version introduced in this PR:

• 1.7.2

This PR addresses the following Issue/Feature(s):

• GA-1018552

Summary of changes:

• Changes merged_object_ids data type to a string to prevent merge_contacts macro from throwing an error.

Submission Checklist

• Alignment meeting with the reviewer (if needed)
  • Timeline and validation requirements discussed
• Provide validation details:
  • Validation Steps: Check for unintentional effects (e.g., add/run consistency & integrity tests)
  • Testing Instructions: Confirm the change addresses the issue(s)
  • Focus Areas: Complex logic or queries that need extra attention
• Merge any relevant open PRs into this PR

Changelog

• Draft changelog for PR
• Final changelog for release review