Store interop parameters in auxiliary data structures

Instead of assuming that various operations happen in order.

Since each interop event has a unique time, this makes it easier to
ensure that the correct response is associated with each event. Without
this, there is the possibility of a race condition between the
asynchronous registration handling from the data host manager and the
storage-sequence task.

This will make it easier to support redirect chains in interop tests
without flakiness.

Bug: 330555387
Change-Id: I78892ba7d2a8bfdfcf7540c95727386c2a8d29ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5402806
Reviewed-by: Nan Lin <linnan@chromium.org>
Commit-Queue: Andrew Paseltiner <apaseltiner@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1279161}