perf(core): remove dead code in setupWorkspaces

[paul-soporan]

What's the problem this PR addresses?

setupWorkspaces tries to populate workspace.dependencies using the corresponding package from storedPackages, which isn't populated until a resolution / restoreInstallState pass is run, so the code is completely useless.

How did you fix it?

Removed the code since it serves no purpose and the field is populated later anyways.

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.