hubble: add a couple of "any interface" filter test cases #34984
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Explicit how a Hubble API user can request flows with "any interface" set, by setting a non-empty repeated interface filter (e.g. non-empty slice from Go) with a zero values filter. Like other filters, a logical inverse of this "any interface" filter can be queried using the same construction under the
GetFlowsRequest.blacklist
set of filters instead ofGetFlowsRequest.whitelist
.