parameterize extensions

[purplecabbage]

Description

We have some dialog input that is not easily automated for e2e/integration tests. This pr adds a --extension:String flag to allow easy testing.

currently --extension is expected to be one ( or more ) of [dx/asset-compute/worker/1, dx/excshell/1, application]

Related Issue

https://jira.corp.adobe.com/browse/ACNA-1271

How Has This Been Tested?

with tests

Screenshots (if appropriate):

Types of changes

• 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.

[moritzraho]

one comment otherwise lgtm

[sandeep-paliwal]

LGTM

[codecov]

Codecov Report

Merging #476 (f1d0670) into master (d15b5a9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #476   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           43        43           
  Lines         2252      2258    +6     
  Branches       373       375    +2     
=========================================
+ Hits          2252      2258    +6     

Impacted Files	Coverage Δ
src/commands/app/init.js	100.00% <100.00%> (ø)

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