Revert "Move generated LUCI files"

This reverts commit abde297cd9e8f52fb0e27dc94327ebfad26da96a.

Reason for revert: Speculative revert for CQ not working.

Bug: 385317083
Original change's description:
> Move generated LUCI files
>
> Moves the generated LUCI config files from
> //infra/config/global/generated to //infra/config/global/generated/luci.
> This should be a functional no-op.
>
> This is in line with what Chromium does and is a prerequisite for some
> upcoming Starlark changes for several reasons:
>
> 1. We'll be generating significantly more files in the near future, so
>    it is helpful to group them appropriately.
> 2. The Starlark code we are taking a dependency on currently assumes
>    that the generated LUCI files are in a luci/ subdirectory. While this
>    should be fixed in the longer term, moving these files will unblock
>    us sooner.
>
> Bug: 385317083
> Change-Id: Ib60f354d94833dc13abc8e653d213d76073eec7d
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/255618
> Auto-Submit: Brian Sheedy <bsheedy@google.com>
> Reviewed-by: Kai Ninomiya <kainino@chromium.org>
> Commit-Queue: Kai Ninomiya <kainino@chromium.org>

TBR=kainino@chromium.org,bsheedy@google.com,dawn-scoped@luci-project-accounts.iam.gserviceaccount.com

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 385317083
Change-Id: Ie8314fda75d317873f79d7dafe708580afab4c99
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/255562
Commit-Queue: Brian Sheedy <bsheedy@google.com>
Reviewed-by: Brian Sheedy <bsheedy@google.com>
Reviewed-by: James Price <jrprice@google.com>