[clang] [LifetimeSafety] Use buildOriginFlowChain for remaining diagnostics in issuePendingWarnings (PR #212083)

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https://github.com/NeKon69 approved this pull request.

The tests seem to have passed, so this LGTM.
Let's wait for one more approval, maybe they know something that might've got broken here.

https://github.com/llvm/llvm-project/pull/212083