Don't jump to autocomplete until finished loading

A user entered a lab ID so fast into the autocomplete then pressed enter, and it loaded an unrelated sample.

See if it's possible to only do the enter to load after the autocomplete results have come back

Start by tracing the autocomplete entry handling and the path triggered when Enter is pressed immediately after entering a lab ID. Reproduce the fast-entry case, then verify that Enter cannot load a result until autocomplete results have finished loading and that the unrelated sample is no longer opened.

Written by the indexing model from the issue text.