fix(common): support npm pack and consolidate npm publishing

Fixes #8586.

All npm publish actions in the repository are now run as part of the
Developer release build, hosted at present by kmc, until we setup a
higher-level build script to do it.

Adds a 'pack' action which mirrors 'publish' for all npm packages.

Removes unnecessary dev dependencies of models-templates and
models-wordbreakers from kmc-model.

Web Release build CI step has been updated to check for presence of
.build-builder.