Remove dev dependencies from dependencies list

[cabljac]

Several extensions have things like jest and @types/... packages in their dependencies.

These should be moved to devDependencies.

In the past the reason for @types/... being in dependencies was because it needed to be for the build step of the extension. I'm not sure what the situation is now.

This should be checked across all 4 official repositories.

[dackers86]

As the build processes uses docker, can we make sure this works as expected on install. Typically, in the past some dependencies will causes errors as the module cannot be found.