feat(ios): parse the archive plist's CreationDate field

[trevor-e]

Resolves EME-632

[linear]

EME-632 iOS date_built

[NicoHinderling]

nit: I think this could also be written as

plist = xcarchive.get_archive_plist() or {}
date = plist.get("CreationDate")
build_date = date.isoformat() if date else None

[trevor-e]

Removed the if creation_date: branch but keeping the if archive_plist: check, would rather not default to or {} in this case.

[codecov]

Codecov Report

❌ Patch coverage is 67.85714% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.53%. Comparing base (416af31) to head (5e7168d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/launchpad/artifacts/apple/zipped_xcarchive.py	57.89%	6 Missing and 2 partials ⚠️
src/launchpad/size/analyzers/apple.py	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #475      +/-   ##
==========================================
- Coverage   80.56%   80.53%   -0.03%     
==========================================
  Files         161      161              
  Lines       13644    13672      +28     
  Branches     1448     1451       +3     
==========================================
+ Hits        10992    11011      +19     
- Misses       2111     2117       +6     
- Partials      541      544       +3     

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[sentry]

Issues attributed to commits in this pull request

This pull request was merged and Sentry observed the following issues:

• ‼️ RuntimeError: Failed to extract basic app informat... in us