Add middleware_address field to the serializer

[aeswibon]

Bug Fix

Proposed Changes

• Added middleware_address field to the serializer

Associated Issue

• Required by Facility Config Page care_fe#4122

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Base: 55.87% // Head: 55.87% // No change to project coverage 👍

Coverage data is based on head (c36874c) compared to base (45a8142).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1115   +/-   ##
=======================================
  Coverage   55.87%   55.87%           
=======================================
  Files         175      175           
  Lines        8729     8729           
  Branches     1493     1493           
=======================================
  Hits         4877     4877           
  Misses       3800     3800           
  Partials       52       52           

Impacted Files	Coverage Δ
care/facility/api/serializers/facility.py	83.87% <ø> (ø)

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