This is a reland of commit 7787ed20

Updates since original: specified that cctest sources depend on
generated files from the inspector.

Original change's description:
> Build cctest while building V8
>
> I noticed in a recent build that C++ files from cctest didn't start
> compiling until after several slow non-parallel tasks such as running
> mksnapshot and linking v8_for_testing. I don't see any reason that
> cctest sources should wait for those tasks, so in this change I propose
> adjusting the build dependencies for more parallelism.
>
> Change-Id: I2472117c8555ac397fa1232954c8b699d6429d38
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3690170
> Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Cr-Commit-Position: refs/heads/main@{#80976}

Change-Id: I9f507c3c07bda1638b81de4b1ac82afda1168999
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3699405Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81112}