[eas-cli] create keystore for Android emulator builds in `init:onboarding`

[szdziedzic]

Why

https://exponent-internal.slack.com/archives/C06EBFAVCEA/p1715397103308639

create keystore for Android emulator builds in init:onboarding

How

create keystore for Android emulator builds in init:onboarding

Test Plan

test manually

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 53.54%. Comparing base (e1ebcc0) to head (13671ef). Report is 1 commits behind head on main.

Files	Patch %	Lines
...ackages/eas-cli/src/commands/project/onboarding.ts	0.00%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2379 +/- ## ========================================== - Coverage 53.55% 53.54% -0.01% ========================================== Files 530 530 Lines 19513 19517 +4 Branches 4135 4139 +4 ========================================== Hits 10449 10449 - Misses 8332 8336 +4 Partials 732 732 ```

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[github-actions[bot]]

Size Change: +972 B (0%)

Total Size: 51.3 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	51.3 MB	+972 B (0%)

_{compressed-size-action}

[github-actions[bot]]

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