chore: updating Github action workflows

[harsh62]

Issue #

Why

• GitHub Actions removed base simulators from Xcode 16.0, breaking minimum version builds
• Push Notification tests failing due to simulator set conflicts

What

• Auto-download missing simulators for Xcode 16.0 via new composite action
• Fix Push Notification tests by aligning with working WebAuthn approach (remove --set testing flags)
• Add Xcode beta workflow for testing future versions
• Improve device ID extraction with fallback strategies for clone devices

Refer: https://github.blog/changelog/2025-07-11-upcoming-changes-to-macos-hosted-runners-macos-latest-migration-and-xcode-support-policy-updates

General Checklist

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• All integration tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.76%. Comparing base (1867326) to head (e9a03c9).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4036      +/-   ##
==========================================
- Coverage   67.78%   67.76%   -0.03%     
==========================================
  Files        1129     1129              
  Lines       52478    52478              
==========================================
- Hits        35574    35561      -13     
- Misses      16904    16917      +13     

Flag	Coverage Δ
API_plugin_unit_test	70.09% <ø> (-0.24%)	⬇️
AWSPluginsCore	69.25% <ø> (ø)
Amplify	47.96% <ø> (+0.03%)	⬆️
Analytics_plugin_unit_test	85.20% <ø> (ø)
Auth_plugin_unit_test	73.63% <ø> (+0.01%)	⬆️
DataStore_plugin_unit_test	83.26% <ø> (-0.10%)	⬇️
Geo_plugin_unit_test	74.86% <ø> (ø)
Logging_plugin_unit_test	65.27% <ø> (ø)
Predictions_plugin_unit_test	34.77% <ø> (ø)
PushNotifications_plugin_unit_test	88.43% <ø> (ø)
Storage_plugin_unit_test	79.39% <ø> (ø)
unit_tests	67.76% <ø> (-0.03%)	⬇️

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[thisisabhash]

why only macOS?