[Bug 2098105] Re: Enable the HWE kernel flavor for 24.04.3

[Skia]

After further discussion, let's release that, in order to build the images before the week-end. Rational for releasing now is:
* livecd-rootfs isn't installed on user's machine, so can't really break too much stuff.
* Daily CRON job building the images is currently disabled because of the release. That's the biggest thing  that could break, and is currently well monitored and triggered manually.
* Having the images out and the call for testing just before the week-end would help the flavors have a longer time to test, especially when those are driven by volunteers that only have time during the week-end.

** Tags removed: verification-needed verification-needed-noble
** Tags added: verification-done verification-done-noble

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Title:
  Enable the HWE kernel flavor for 24.04.3

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Noble:
  Fix Released

Bug description:
  [ Impact ]

  As part of 24.04.2, we should have enabled the HWE kernel for desktop and server.
  Desktop switches to HWE by default, but server images need to offer both.
  Additionally, desktop flavors make that switch too at the same time.

  Unfortunately, this was overlooked for .2, but will be necessary for
  24.04.3. The goal is to land that as soon as Noble .2 is out, so that
  people really needing the HWE stack will be able to grab a daily.

  [ Test Case ]

  1. livefs-builds
  * See https://git.launchpad.net/~dbungert/+git/livecd-rootfs-testing/tree/livefs-build-with-a-ppa.md?h=main for a procedure for building a livefs in launchpad.
  * trigger livefs-builds for the affected PROJECTs and verify the results contain the intended kernel.

  2. image build
  Wait for daily builds once the HWE kernel is available.
  * Double check that the images build correctly.
  * Boot the desktop image and confirm it's using the HWE kernel.
  * Boot the server image and confirm there's a selection of which kernel to use and both GA and HWE kernels work.
  * Check flavor desktop images and make sure those also use the HWE kernel.

  [ Where problems could occur ]

  Any regressions would possibly be around kernel selection for our
  images. Maybe checking flavors if they are still using the right ones
  would make sense. Most issues would be visible with image build
  failures.

  [ Other Info ]

  6.11 HWE stack has already landed in noble-updates, so it's very
  straightforward to confirm which kernel is in use (vs 6.8, GA kernel)

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