Fix generation not including macros from XCFrameworks

[pepicrft]

Short description 📝

A bug in a logic recently introduced to return all the plugin executables for Swift Macros, causes the targets to miss the logic executable Swift flags for pre-compiled Swift Macros in XCFrameworks

Contributor checklist ✅

• The code has been linted using run mise run lint:fix
• The change is tested via unit testing or acceptance testing, or both
• The title of the PR is formulated in a way that is usable as a changelog entry
• In case the PR introduces changes that affect users, the documentation has been updated

Reviewer checklist ✅

• The code architecture and patterns are consistent with the rest of the codebase
• Reviewer has checked that, if needed, the PR includes the label changelog:added, changelog:fixed, or changelog:changed, and the title is usable as a changelog entry