chore(turbo-tasks): Remove support for local_cells (a specific mode of local tasks we ended up not using)

[bgw]

Local cells would allow us to avoid allocating real cells for data passed to local task functions.

Unfortunately, in practice, we manually resolve most arguments passed to local task functions, which would defeat this optimization.

I was holding onto this in the hopes that we might end up using it, but that seems fleeting:

• We could get similar benefits by scanning for unreferenced cells at the end of function execution using TraceRawVcs at the cost of a bit of execution time. This would work even on Vcs that were resolved.
• For ergonomics reasons, we want to eventually rename ResolvedVc to Vc (and Vc to something like UnresolvedVc), which will probably lead to us resolving even more stuff, breaking this potential optimization even more.
• Cache eviction may do a good enough job of removing cells, the bigger enemy are the harder-to-evict tasks, which our current version of local tasks does do a good job of reducing.

Meanwhile, it makes the code harder to follow, and could cause issues if this codepath somehow got activated.

Closes PACK-3903

[bgw]

• chore(turbo-tasks): Remove support for local_cells (a specific mode of local tasks we ended up not using) #75672 👈 (View in Graphite)
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[ijjk]

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