Upgrade Cilium to v1.14

[FedericoAntoniazzi]

Upgrade Cilium for Fury v1.27.

Features

• Upgrade Cilium to v1.14.3
• Upgrade Hubble to v0.12.1
• Add preliminary actions to decrease CNI downtime on upgrade

The documentation introduces the release notes for the next version (v0.15.0) and describes the upgrade procedure for Cilium using the preflight script.

Roadmap

• [x] Upgrade Cilium
• [x] Upgrade Hubble
• [x] Update docs
• [x] Add CI e2e tests for Kubernetes v1.27

Notes

• The upgrade has been tested on a 5 nodes cluster created with Kind
• CNI functionalities have been tested by the cilium connectivity test command

[FedericoAntoniazzi]

Changed the destination branch. will require some more testing to be sure no manifest has been broken solving merge conflicts.