Marking a transitive dependency as external in a monorepo doesn't work

[ericallam]

For example, let's say a trigger task is installed in package A and it's importing from package B. B has a dependency on @huggingface/transformers. This dependency requires being made external, but marking it as external doesn't work. This is happening to someone with the following config:

• pnpm 9.4.0
• turborepo
• @huggingface/transformers 3.1.2

[ericallam]

Have a fix for this coming: #1569