[eas-cli] improve logs announcing loading of env variables

[szdziedzic]

Why

Improve logs announcing loading env vars.

https://exponent-internal.slack.com/archives/C06FK950085/p1729215938823339?thread_ts=1729186741.835629&cid=C06FK950085

How

Improve logs

Test Plan

Test manually.

[szdziedzic]

• [ENG-13252][eas-cli] resolve default environment automatically based on build configuration #2644
• [eas-cli] improve logs announcing loading of env variables #2643 👈 (View in Graphite)
• main

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[github-actions]

CodeMention:

File Patterns	Mentions
**/*	@szdziedzic, @khamilowicz, @sjchmiela
packages/eas-cli/src/build/**	@szdziedzic, @khamilowicz, @sjchmiela

[github-actions]

Size Change: +914 B (0%)

Total Size: 53 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53 MB	+914 B (0%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 53.05%. Comparing base (5aad520) to head (38805c6).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...as-cli/src/build/evaluateConfigWithEnvVarsAsync.ts	0.00%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2643      +/-   ##
==========================================
- Coverage   53.10%   53.05%   -0.05%     
==========================================
  Files         564      566       +2     
  Lines       21498    21615     +117     
  Branches     4212     4236      +24     
==========================================
+ Hits        11415    11466      +51     
- Misses      10053    10119      +66     
  Partials       30       30              

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[github-actions]

❌ It looks like a changelog entry is missing for this PR. Add it manually to CHANGELOG.md.
⏩ If this PR doesn't require a changelog entry, such as if it's an internal change that doesn't affect the user experience, you can add the "no changelog" label to the PR.