rubocops/uses_from_macos: add lldb to provided by macOS

[cho-m]

Planning to split out LLDB in LLVM 23 so adding separate provided by macOS entry so we can annotate formula correctly (i.e. macOS has /usr/bin/lldb provided by CLT/Xcode.app).

• lldb 22.1.8 (new formula) homebrew-core#299464

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[Copilot]

Pull request overview

Adds lldb to the ProvidedByMacos::PROVIDED_BY_MACOS_FORMULAE list so formulae can be annotated as keg_only :provided_by_macos when macOS provides /usr/bin/lldb via CLT/Xcode.

Changes:

• Add lldb to the PROVIDED_BY_MACOS_FORMULAE allowlist used by the FormulaAudit/ProvidedByMacos RuboCop cop.

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