[5.9] Print package-name in .private.swiftinterface only for better abstraction #66256
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Description: package-name flag needs to be printed in .private.swiftinterface
only as package symbols are not contained in public swiftinterface and the
clients of the swiftinterface should not be privy to the package-name input
value. The change has already landed in main; this PR is to enforce the same
behavior on 5.9.
Risk: Low. The change has been on main already and been tested.
Original PR: #65336
Reivewers: @xymus
Testing: Added tests to ensure the flag is abstracted away from public swiftinterface
Resolves: rdar://107638447