fix(eas-cli): make email case insensitive during apple auth

[byCedric]

Why

After fixing Apple authentication, we received some reports of unexpected "invalid account name and/or password" errors. These were related to the case sensitivity of the email, used when generating the proof of credentials for Apple (using RSP6a).

This fixes that.

How

• Make email case insensitive when authenticating with Apple

Test Plan

• eas credentials
• Select iOS
• Try to authenticate using a capital letter in the account name (or email)

[github-actions]

Subscribed to pull request

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

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[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

Size Change: -864 B (0%)

Total Size: 53 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53 MB	-864 B (0%)

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.91%. Comparing base (3e6cf78) to head (0e661d0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2659   +/-   ##
=======================================
  Coverage   52.91%   52.91%           
=======================================
  Files         570      570           
  Lines       21750    21750           
  Branches     4263     4263           
=======================================
  Hits        11506    11506           
  Misses      10213    10213           
  Partials       31       31           

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