fix(shorebird_cli): ensure "downloading release" progress completes

[bryanoltman]

Fixes #2276

[felangel]

Can we add a unit test?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (e7bb5a7) to head (6400bb9).

❗ Current head 6400bb9 differs from pull request most recent head f5b2202

Please upload reports for the commit f5b2202 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2277   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          186       186           
  Lines         5924      5924           
=========================================
  Hits          5924      5924           

Flag	Coverage Δ
shorebird_cli	100.00% <100.00%> (ø)

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[bryanoltman]

Can we add a unit test?

Done