chore(swift-sdk): drop x86_64 architecture support

[ZocoLini]

Extracted this from other PR that I have marked as a draft, I drop Intel Mac fake support from the build script

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5263ce50-4b21-4e68-991c-c2c429cf3d25

📥 Commits

Reviewing files that changed from the base of the PR and between dbc2bdf and b700d6f.

📒 Files selected for processing (1)

• packages/swift-sdk/build_ios.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/build-ios-simplified

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[thepastaclaw]

⏳ Review in progress (commit b700d6f)

[github-actions]

✅ DashSDKFFI.xcframework built for this PR.

• Workflow run: https://github.com/dashpay/platform/actions/runs/24096332863
• Artifacts: DashSDKFFI.xcframework (folder), DashSDKFFI.xcframework.zip, xc_checksum.txt

SwiftPM (host the zip at a stable URL, then use):

.binaryTarget(
  name: "DashSDKFFI",
  url: "https://your.cdn.example/DashSDKFFI.xcframework.zip",
  checksum: "31dd7e43023137e71cb7414a21d3edf47ae6544e311c2d5caa7885d6d2c0d0cb"
)

Xcode manual integration:

• Download 'DashSDKFFI.xcframework' artifact from the run link above.
• Drag it into your app target (Frameworks, Libraries & Embedded Content) and set Embed & Sign.
• If using the Swift wrapper package, point its binaryTarget to the xcframework location or add the package and place the xcframework at the expected path.