fix: handle failures from pre-pack hook

[purplecabbage]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #727 (3f4c7e1) into master (814908d) will not change coverage. Report is 1 commits behind head on master. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #727   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        56    -1     
  Lines         3229      3188   -41     
  Branches       607       599    -8     
=========================================
- Hits          3229      3188   -41     

Files	Coverage Δ
src/commands/app/add/event.js	100.00% <100.00%> (ø)
src/commands/app/deploy.js	100.00% <100.00%> (ø)
src/commands/app/pack.js	100.00% <100.00%> (ø)
src/commands/app/undeploy.js	100.00% <100.00%> (ø)

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