Update EnvironmentVariableCreate for multiple environments, add tests

[khamilowicz]

Why

ENG-13525: Update EAS-CLI for new EnvVar features

Update eas env:create to accept multiple --environment parameters.

How

• Use EASMultiEnvironmentFlag in EnvironmentVariableCreate
• Update variable display with environment and updatedAt fields

Test Plan

Added tests

[linear]

ENG-13525 Update EAS-CLI for new EnvVar features

[khamilowicz]

• Refactor env:list and add tests #2588 : 2 dependent PRs (#2589 , #2591 )
• Refactor env:link, add tests #2587
• Refactor env:update, add tests #2586
• Add tests for EnvironmentVariableDelete #2585
• Add tests to EnvironmentVariableGet #2584
• Update EnvironmentVariableCreate for multiple environments, add tests #2583 👈
• Allow prompting for multiple environments #2582
• Update EnvironmentVariableMutation and associated commands #2581
• Update Environment Variables queries: #2580
• main

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[github-actions]

Size Change: +4.69 kB (+0.01%)

Total Size: 52.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	52.9 MB	+4.69 kB (+0.01%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 77.96610% with 13 lines in your changes missing coverage. Please review.

Project coverage is 52.14%. Comparing base (37a68c5) to head (ac67608).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/env/create.ts	77.09%	9 Missing and 2 partials ⚠️
packages/eas-cli/src/utils/variableUtils.ts	77.78%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2583      +/-   ##
==========================================
+ Coverage   51.87%   52.14%   +0.27%     
==========================================
  Files         563      563              
  Lines       21303    21327      +24     
  Branches     4348     4361      +13     
==========================================
+ Hits        11049    11118      +69     
+ Misses       9366     9332      -34     
+ Partials      888      877      -11     

Flag	Coverage Δ
	52.14% <77.97%> (+0.27%)	⬆️

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[khamilowicz]

Merge activity

• Oct 1, 4:35 AM EDT: @khamilowicz started a stack merge that includes this pull request via Graphite.
• Oct 1, 4:44 AM EDT: Graphite rebased this pull request as part of a merge.
• Oct 1, 4:45 AM EDT: @khamilowicz merged this pull request with Graphite.

[github-actions]

⏩ The changelog entry check has been skipped since the "no changelog" label is present.

[github-actions]

CodeMention:

File Patterns	Mentions
**/*	@szdziedzic, @khamilowicz, @sjchmiela