Add build runtime and remove outdated config

[BPScott]

Description

While investigating rollup builds I found some polish that could be applied to our current process.

• Sewing-kit has a concept of "runtimes" that allows you to specify what a project can be compiled for. We weren't using this. While the buildFlexibleOutputs plugin doesn't leverage this too heavily, the rollup plugin can be configured to skip builds for irrelevant runtimes. e.g. there's no point doing an esnext build for a package like koa-liveness-ping that is node-only.
• Packages still had a build script referencing tsc - We don't use that anymore so it can be removed.
• Packages had a dependency on tslib - This is no longer the case as we don't compile with tsc anymore.

This PR:

• Adds runtimes to each package's sewing-kit.config.ts
• Removes all dependencies on tslib in project package.json files
• Removes all builds scripts using tsc in project package.json files

Type of change

• EVERY PACKAGE Patch: Bug (non-breaking change which fixes an issue)

Checklist

• I have added a changelog entry, prefixed by the type of change noted above (Documentation fix and Test update does not need a changelog as we do not publish new version)

[kaelig]

👋 Please run:

git pull origin main --rebase && git push origin sknext-build-tidyups --force

to get the latest changes and fix the failing test, apologies for the inconvenience.

[ismail-syed]

Awesome clean up work! 🎉