Ensure that proxy operations look for attribution tag in proxy's pkg

When calling note/startProxyOp, we should look for both attribution
tags, proxy and proxied, in the proxy app. Log an error, instead of
throwing, when we find the proxied attribution tag in the proxy app

Bug: 187313675
Test: manual
Change-Id: I8a5db05b9728c0bb92f334fbac9baa7ef62fe619