Add the ability to override the fallback email

[abdullah-kasim]

Description

Changelog Description

Pre-review checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally (or has an appropriate fallback).
• This change works and has been tested on a Go sandbox.
• This change has relevant unit tests (if applicable).
• This change uses a rollout method to ease with deployment (if applicable - especially for large scale actions that require writes).
• This change has relevant documentation additions / updates (if applicable).
• I've created a changelog description that aligns with the provided examples.

Pre-deploy checklist

• VIP staff: Ensure any alerts added/updated conform to internal standards (see internal documentation).

Steps to Test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.95%. Comparing base (a0b1c87) to head (bf3aabb).
Report is 14 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #5342      +/-   ##
=============================================
- Coverage      29.02%   28.95%   -0.07%     
- Complexity      4823     4824       +1     
=============================================
  Files            283      283              
  Lines          20946    20936      -10     
=============================================
- Hits            6079     6063      -16     
- Misses         14867    14873       +6     

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud