Allow opting out of the automatic global dependencies hashing

[runspired]

Goals

• give consumers more control over dependency hashing
• avoid expensive unnecessary cache busts

Non-goals

Background

When a monorepo package like @internal/tooling is listed as a dependency of the root package.json, all of its files become inputs for all tasks, meaning changing anything in the tool causes all caches to miss.

This is bad for 2 reasons:

1. many tools in root are only in root to expose executables for which much simpler cache keys can be hashed.
2. unlike everything else in a turbo config, the consumer has no control over this

Proposal

provide a mechanism for overriding the globalDependencies hashing defaults that turbo provides