SDK-325 BCIT Migrate temp domain setup to final custom domain

[joaodordio]

🔹 Jira Ticket(s)

• SDK-325

✏️ Description

Migrating the BCIT integration tests off the temporary tsetester.com domain and onto the official engineering-owned bcittesting.com (procured via IT-4410).

What changed

• iterablesdk-integration-tester.entitlements: associated domain applinks:links.tsetester.com -> applinks:links.bcittesting.com
• AppDelegate.swift: URL host checks and log strings now reference bcittesting.com / links.bcittesting.com
• UpdateViewController.swift: comment and on-screen flow info text updated
• DeepLinkingIntegrationTests.swift: all test URL constants point at the new domain. The two wrapped click URLs are stubbed with a TODO_REGENERATE_TOKEN placeholder and a TODO(SDK-325) comment, since the _t/_m/_e tokens are tied to the old Iterable project.

Why the wrapped URL is a placeholder

The wrapped link tokens are project-scoped, so they will only become valid once SDK-36 #1061 lands and we can regenerate the link against the new project. I left a loud TODO_REGENERATE_TOKEN so any test run that uses it fails fast with a 404 instead of silently passing or hitting the old project.

Dependencies / sequencing

This PR is intentionally not ready to merge yet. The order is:

1. Merge SDK-36 SDK-36 Migrate BCIT to Mobile SDK Testing project #1061 (new Mobile SDK Testing project)
2. Merge iterable-infra #15167 so links.bcittesting.com resolves and serves AASA
3. Configure the tracking + destination domain on the new Iterable project, upload AASA / assetlinks
4. Regenerate the wrapped link, replace the TODO_REGENERATE_TOKEN in this PR, then merge

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.97%. Comparing base (fa9f26a) to head (71feded).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1062      +/-   ##
==========================================
- Coverage   71.03%   70.97%   -0.06%     
==========================================
  Files         112      112              
  Lines        9238     9238              
==========================================
- Hits         6562     6557       -5     
- Misses       2676     2681       +5     

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