[two_dimensional_scrollables] Delete iOS and macOS placeholder tests

[jmagman]

From #10764

These tests should just be removed; it's the placeholder that's part of the template, and we don't ever expect to run these tests in a non-plugin package like this one. Usually we remove them, it just got missed here.

It's dead code from a repo tool perspective, because we won't try to run these tests for a non-plugin package.

Pre-Review Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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• I read and followed the relevant style guides and ran the auto-formatter.
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• I linked to at least one issue that this PR fixes in the description above.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or I have commented below to indicate which version change exemption this PR falls under¹.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style, or I have commented below to indicate which CHANGELOG exemption 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.

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Footnotes

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[jmagman]

Xcode wanted to delete the quotes, let it.

[stuartmorgan-g]

I know it's still a draft, but LGTM :)

[gemini-code-assist]

Code Review

This pull request removes placeholder test files and their associated configurations for both iOS and macOS from the two_dimensional_scrollables example application. The deleted files (RunnerTests.swift) and the modifications to the Xcode project files (.pbxproj) correctly remove the unused test targets, which were boilerplate from the project template and are not needed for this non-plugin package. The changes are clean and align with the goal of removing dead code.