endpoint: Inherit context during identity allocation
endpoint: Inherit context during identity allocation

Inherit the identity allocation context from the parent function when
calling into identityLabelsChanged(). This function isn't a background
thread, and it receives a context so it should respect the passed
context.

Signed-off-by: Joe Stringer <16a9a54ddf4259952e3c118c763138e83693d7fd@cilium.io>

cilium/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,cilium-team/cilium,cilium/cilium,cilium/cilium,cilium-team/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,michi-covalent/cilium