[manual] Merge release/6.0-staging into release/6.0 #107572

…ease/6.0-staging [automated] Merge branch 'release/6.0' => 'release/6.0-staging'

Starting on macOS Sequoia, at least in beta, SecKeychainitemCopyKeychain no longer returns errSecNoSuchKeychain for ephemeral keys. Instead, it returns errSecInvalidItemRef. This adds the error code in the handling logic for when we need to add an ephemeral key to the target keychain. Co-authored-by: Kevin Jones <[email protected]>