Confusing names for source and destination security identities in Hubble UI

[pchaigno]

In Hubble UI, the column for the source and destination security identities are currently called Source Service and Destination Service: https://github.com/cilium/hubble-ui/blob/1b43cefd761dae976d03b76d632147b3d3871cff/src/components/FlowsTable/general.ts#L10-L13

That's a bit confusing because:

• They seem to be security identities (e.g., unmanaged) and not e.g. VIPs.
• There is no such thing as a service identity. Identities are assigned to pods, nodes, and even CIDRs, but not VIPs since we enforce policies on the backend pod.

Is there a reason for this naming?

[pchaigno]

Discussed offline and concluded we can rename to Source Identity and Destination Identity even if not all security-relevant labels are shown.