[release-2.25] CI: Remove Debian 10 support & macvlan test move to Debian 11 (#11429)

* CI: macvlan test switch to debian 11 & default job

Signed-off-by: tico88612 <17496418+tico88612@users.noreply.github.com>

* CI: cilium-svc-proxy test switch to debian 12

Signed-off-by: tico88612 <17496418+tico88612@users.noreply.github.com>

* CI: remove debian 10 test

Signed-off-by: tico88612 <17496418+tico88612@users.noreply.github.com>

* Docs: remove debian 10 support

Signed-off-by: tico88612 <17496418+tico88612@users.noreply.github.com>

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Signed-off-by: tico88612 <17496418+tico88612@users.noreply.github.com>
Co-authored-by: tico88612 <17496418+tico88612@users.noreply.github.com>