Refactor DNS code

Due to the growth of this repo, now including custom dns names, load balancers, etc, the code that manages domain names has become unintelligible.

Refactor this code to make it more clear, readable, and documented.

added to epic uis/devops&25

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changed the description

changed milestone to %Backlog

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Moved to %Backlog as we need to discuss with @amc203 about whether we can always create a load balancer and therefore get rid of the code which does domain mapping - which would make this refactor a lot easier.

added workflowNeeds Refinement label

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removed milestone %Backlog

mentioned in issue #39 (closed)

changed time estimate to 3d

added spike workflowSprint Ready labels and removed workflowNeeds Refinement label

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changed iteration to Cloud Team Sprints Jan 31, 2024 - Feb 13, 2024

removed iteration Cloud Team Sprints Jan 31, 2024 - Feb 13, 2024

changed iteration to Cloud Team Sprints Feb 14, 2024 - Feb 27, 2024