Update Serval App

[Enkidu93]

• Cache token in db
• Remove emailing and background process
• Add build-visibility
• Be able to delete, cancel, download pretranslations, and download the model from a build

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This change is 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.26%. Comparing base (5bdf74b) to head (b3a2242).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #341   +/-   ##
=======================================
  Coverage   70.26%   70.26%           
=======================================
  Files         151      151           
  Lines        7049     7049           
  Branches     1120     1120           
=======================================
  Hits         4953     4953           
  Misses       1642     1642           
  Partials      454      454           

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[johnml1135]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Enkidu93)

[johnml1135]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Enkidu93)