Release notes for Gardenlinux images

1862.0.3:

• Update intel microcode,
• update kernel to 6.12.28,
• containerd 1.7.27, runc 1.2.5,
• Update gardenlinux version to 1862,
• Add separate /var/log partition to cloud images.

1721.0.9:

• Kernel updated to 6.6.65,
• updated microcode package for Intel,
• update gardenlinux version to 1862,
• removed docker from shoot images for compatibility with Gardener v1.102+.