Add hsim js bindings build to CircleCI.

[msbaines]

Motivation and Context

• Add javascript binding build to CircleCI in order to prevent breakages of emscripten build.
• To enable this, I needed to add logic in build_js.sh to build corrade-rc.

How Has This Been Tested

CircleCI

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[msbaines]

It is now passing and all feedback should be addressed.

[mathfac]

@msbaines thank you for adding JS build step to CI, that's important part of new functionality reliability. Small comment, overall looks great.

[mathfac]

This step increases whole testing for 4 min. Unfortunately, when background: true option is used step can't fail the testing and is considered successful. Let's keep it as is right now and parallelize later when we have more understanding what other tests we will run for JS build, physics, C++.