Edera host kernel artifacts should get an `-edera` suffix to avoid collisions

[found-it]

Our kernels should have an edera suffix for both /lib/modules/<kver> and all boot artifacts, so it's more obvious which kernel artifacts are ours on-disk, and so we don't stomp other kernel's artifacts in BYO situations.

This shouldn't be hard to add and most distros do this already.

e.g. today for host kernels we lay out the following on the host disk:

• /boot/config-6.18.16
• /boot/initramfs-6.18.16
• /lib/modules/6.18.16

but we should lay out:

• /boot/config-6.18.16-edera
• /boot/initramfs-6.18.16-edera
• /lib/modules/6.18.16-edera

[passionworkeer]

A small implementation detail that should reduce breakage: derive a single suffixed kernel version (for example ${KERNELRELEASE}-edera) at build time and use that same value everywhere modules/install artifacts are written. In practice that usually means updating the install path, initramfs output name, and any bootloader/kernel-install hooks from one source of truth, rather than renaming files afterward. It would also be worth grepping for consumers of the unsuffixed version so depmod/dracut and cleanup logic stay aligned.