[6.2][Distributed] pointer auth protocol pointers as we use conformsToProtocol #81394
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Description: We should be signing metadata pointers in the distributed runtime in order to avoid any future potential signing issues, and improve security of this lookup.
Scope/Impact: Low
Risk: Low, the identical pattern is done elsewhere.
Testing: Manually verified on arm64e
Reviewed by: @xedin @aschwaighofer who did similar changes around the codebase and knows the impact.
Original PR: #81372
Radar: rdar://150976815