[ENG-12371][eas-cli] allow user to select package manager when doing onboarding

[szdziedzic]

Why

allow the user to select package manager when doing onboarding

How

allow the user to select package manager when doing onboarding

Test Plan

[linear]

ENG-12371 Detect what package manager are installed during `eas init:onbording` and prompt user to select a package manager

[github-actions]

Size Change: -201 B (0%)

Total Size: 51.3 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	51.3 MB	-201 B (0%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 8.16327% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 53.29%. Comparing base (f0e3b64) to head (7fa26ed).

Files	Patch %	Lines
packages/eas-cli/src/onboarding/packageManagers.ts	8.34%	30 Missing and 3 partials ⚠️
...ackages/eas-cli/src/commands/project/onboarding.ts	7.70%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2402      +/-   ##
==========================================
- Coverage   53.40%   53.29%   -0.11%     
==========================================
  Files         530      531       +1     
  Lines       19527    19575      +48     
  Branches     3967     3976       +9     
==========================================
+ Hits        10427    10431       +4     
- Misses       8348     8389      +41     
- Partials      752      755       +3     

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[szdziedzic]

/changelog-entry new-feature Allow selecting package manager when doing onboarding

[github-actions]

✅ Thank you for adding the changelog entry!