Issue 549: Extra post-processing steps

[SamuelBrand1]

This PR closes #549 .

The post-processing steps add here are:

• Add a small script to combine the truthdata.
• Refactor the EpiAwarePipeline that does this and add unit test.
• Combine into a single script that complies with DRY principle.

[github-actions]

Try this Pull Request!

Open Julia and type:

import Pkg
Pkg.activate(temp=true)
Pkg.add(url="https://github.com/CDCgov/Rt-without-renewal", rev="post-processing", subdir="EpiAware")
using EpiAware

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.04%. Comparing base (8229711) to head (9b04d43).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #551   +/-   ##
=======================================
  Coverage   91.04%   91.04%           
=======================================
  Files          61       61           
  Lines         871      871           
=======================================
  Hits          793      793           
  Misses         78       78           

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