[camera] Regenerate iOS example with Swift

[stuartmorgan-g]

Updates the iOS example app for camera_avfoundation to a Swift app. Rather than edit in place, this replaces the example app with a fresh copy to minimize drift from current template:

• The existing ios/ directory was deleted
• A new copy was created with flutter create --platforms=ios --org=dev.flutter .
• The RunnerTest code was restored (other than unused files; see [camera_avfoundation] Remove unused Objective-C testing files #11240), and the placeholder file removed.
• The important Info.plist entries were restored.
• The special logic to bypass app launch plugin registration during unit tests was moved from main.m, which no longer exists, to the delegate callback where registration would be done.

I also did some minor test file cleanup I noticed while validating everything in Xcode again:

• Remove some stale references to and usage of the FLT prefix (missed during Swift migrations).
• Added some missing headers that local compilation complained about.

This is part of an overall modernization of the example apps; most packages have already been converted to Swift examples.

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the AI contribution guidelines and understand my responsibilities, or I am not using AI tools.
• I read the Tree Hygiene page, which explains my responsibilities.
• I read and followed the relevant style guides and ran the auto-formatter.
• I signed the CLA.
• The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• I linked to at least one issue that this PR fixes in the description above.
• I followed the version and CHANGELOG instructions, using semantic versioning and the repository CHANGELOG style, or I have commented below to indicate which documented exception this PR falls under¹.
• I updated/added any relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or I have commented below to indicate which test exemption this PR falls under¹.
• All existing and new tests are passing.

Footnotes

1. Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling. ↩↩²

[gemini-code-assist]

Code Review

This pull request updates the iOS example app for camera_avfoundation to Swift, modernizing the example apps. The changes include replacing the existing Objective-C app with a fresh Swift copy, restoring RunnerTest code, updating Info.plist entries, and moving app launch plugin registration logic. Additionally, some minor test file cleanup was performed, such as removing stale references and adding missing headers. The review focuses on ensuring the correctness of the changes, particularly the migration to Swift and the restoration of testing functionality.

[gemini-code-assist]

The comment refers to FLTCam which no longer exists. Update the comment to reflect the current architecture using Camera.

Suggested change

	/// Tests of `CameraPlugin` methods delegating to `FLTCam` instance
	/// Tests of `CameraPlugin` methods delegating to `Camera` instance