Add capability to specify variable entitlements

[lucasmpaim]

Currently, Xcode don't have a good support for variables inside an entitlement value, causing an issue in projects with multiple environments and appclip

Resolves #5940

For some reason, Xcode are not solving variables defined in xcconfig on the entitlements file and for appclips the linter are forcing us to provide one file:

An AppClip '[REDACTED]' requires its Parent Application Identifiers Entitlement to be set
Fatal linting issues found
Consider creating an issue using the following link: https://github.com/tuist/tuist/issues/new/choose

So this PR provides a capability to provide this file using a xcconfig settings, changing the CODE_SIGN_ENTITLEMENTS variable in a dynamic way.

Short description 📝

Add capability to set CODE_SIGN_ENTITLEMENTS on XCConfig to be able to sign appclip properly in a project with multiple environments

How to test the changes locally 🧐

Create a target with multiple configs one should have a different bundle_id
add a appclip to this target
Add a xcconfig settings on project
Create one entitlements file per config
Set .xcconfig() or a string literal "$()" on appclip entitlement

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

[kwridan]

Thanks for contributing this @lucasmpaim

[kwridan]

@all-contributors add @lucasmpaim for code

[allcontributors]

@kwridan

I've put up a pull request to add @lucasmpaim! 🎉

[kwridan]

Thanks for the updates @lucasmpaim

[fortmarek]

Just two minor comments, afterwards, we can merge 🙂