feat: Introduce message composer uploads persistence

[dougfabris]

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CORE-1956

[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is missing the 'stat: QA assured' label
• This PR is targeting the wrong base branch. It should target 8.9.0, but it targets 8.8.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.07%. Comparing base (ed594fd) to head (5b706df).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #40111      +/-   ##
===========================================
- Coverage    69.11%   69.07%   -0.05%     
===========================================
  Files         3759     3759              
  Lines       147859   147859              
  Branches     26420    26414       -6     
===========================================
- Hits        102196   102133      -63     
- Misses       41179    41244      +65     
+ Partials      4484     4482       -2     

Flag	Coverage Δ
unit	70.59% <ø> (-0.06%)	⬇️

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