[6.0] [SymbolGraphGen] Handle cxx module imports in swift-symbolgraph-extract #74016
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Explanation: Updates swift-symbolgraph-extract to parse "-cxx-interoperability-mode" flags and updates the underlying compiler invocation. This fixes a bug where were are unable to extract the symbol graph from swiftmodules with transitive cxx modules because we parsed cxx headers as c headers.
Scope: Documentation generation
Issue: rdar://128888548 (Add support for parsing cxx headers)
Original PR: #73963
Risk: Very low, purely additive.
Testing: CI & at desk usage directly and via SwiftPM
Reviewer: @bnbarham @egorzhdan @daniel-grumberg