DBC22-5363: fix malformed CMS moderation notification email links

[ray-oxd]

📝 Submitter

🔗 JIRA Ticket

• Ticket Link: DBC22-5363

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✅ Quality Assurance & Requirements

• Requirements Met: I have confirmed that all acceptance criteria from the JIRA ticket are fulfilled.
• Tested desktop in local or dev envs
• Tested mobile in local or dev envs
• Ran unit tests locally
• SonarCloud: I have verified that the SonarCloud analysis is clean/passing for this branch.

⚙️ Configuration & Environment

• New Env Variables: No (or Yes with list if you added any)

🧪 How to Test (if required)

1. Sign into Wagtail CMS.
2. Create or edit an Advisory or Bulletin, Save Draft, then Submit to Moderators approval.
3. Check the moderator's email inbox.
4. Confirm preview, edit, and notification preference links are valid absolute URLs that open the correct CMS pages.

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🔍 Reviewer Checklist

• Reviewed code for logic and cleanliness
• Re-tested desktop/mobile in local or dev envs
• Verified no new console warnings/errors
• Confirmed that any new env variables are understood/documented

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud