[SC-43991] update pipeline imports

[nrutman]

Updates imports in the package

• Adds PipelineRollbackError to the main error/index.ts file
• Moves builds to tsup (tsup bundles the library into a single file rather than multiple files…which removes the need for global imports that causes webpack to 🤮)

[mmhand123]

Paired on it a bit live ! Also tested locally with npm link and verified lambda starts up. Looks great. Think we should look at standardizing on this for all our npm packages probably.