Cilium 1.12 Upgrade (#9225)

* Drop support for Cilium < 1.10

Signed-off-by: necatican <necaticanyildirim@gmail.com>

* Synchronize Cilium templates for 1.11.7

Signed-off-by: necatican <contact@necatican.com>

* Set Cilium v1.12.1 as the default version

Signed-off-by: necatican <contact@necatican.com>

Signed-off-by: necatican <necaticanyildirim@gmail.com>
Signed-off-by: necatican <contact@necatican.com>