feat(samples): xcode 27

[renefloor]

🎯 Goal

XCode 27 RC is available, so it's time to switch

🛠 Implementation details

This removes the cocoapods dependency for iOS, no need for it anymore. It also updates the macos runner for building the app.
Raises the minimum macos version for macos app from 10.15 to 13.

☑️Contributor Checklist

General

• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (#flutter-team) (required)
• PR is linked to the GitHub issue it resolves

☑️Reviewer Checklist

• Sample runs & works
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• All code we touched has new or updated Documentation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v2@06f976b). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v2    #1336   +/-   ##
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  Coverage      ?   27.05%           
=====================================
  Files         ?      371           
  Lines         ?    28578           
  Branches      ?        0           
=====================================
  Hits          ?     7732           
  Misses        ?    20846           
  Partials      ?        0           

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