[release-v3.27] Auto pick #8438: proxy - syncer must not count not-ready endpoints #8460
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Cherry pick of #8438 on release-v3.27.
#8438: proxy - syncer must not count not-ready endpoints
Original PR Body below
We include terminating eps in the eps list so that we can prevent conntrack clean up, but they are not written into the backend map and so they should not be reflected in the backends count.
Test that Terminating is propagated through proxy frontend. Test in FV that proxy removes the terminating backend from the NAT table.
refs #8423
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