Fix SwiftPM prebuilt path handling and macro runtime search paths

Tuist now sanitizes control characters and /private/var prefixes from paths decoded from workspace-state.json before converting them to absolute or relative paths. It also adds the prebuilt library directory to LD_RUNPATH_SEARCH_PATHS so macro executables can locate Swift compatibility dylibs such as libswiftCompatibilitySpan.dylib at runtime. This fixes issues that showed up with precompiled SwiftSyntax packages.