DPL-1034: Combine code coverage from both Javascript and Ruby code

[StephenHulme]

Requirement

As a developer I would like to track code coverage for both Ruby and Javascript code within a single application/repo. Currently only Ruby code coverage is monitored and Javascript coverage is ignored.

It should be possible to easily review coverage online on both a per-PR and a repo-as-a-whole basis.

Progress update

While I think it is possible to combine the coverage reports from two different test processes (as demonstrated in this PR), I have not been able to view the new Javascript coverage on Code Climate's interface.

As such, I recommend that we switch to using Codecov for coverage, as we do in other repositories such as Traction-Service.

This change requires team input and should be suggested at the next retro.

UPDATE: switching to CodeCov approved, with a transition period where both services are used simultenously.

Changes proposed in this pull request

• Refactor language test files
• Upload test results to CodeCov
  • Test results are uploaded to CodeCov individually and are merged on their side

Instructions for Reviewers

[All PRs] - Confirm PR template filled
[Feature Branches] - Review code
[Production Merges to main]
    - Check story numbers included
    - Check for debug code
    - Check version

[codecov]

Welcome to Codecov 🎉

Once merged to your default branch, Codecov will compare your coverage reports and display the results in this comment.

Thanks for integrating Codecov - We've got you covered ☂️

[codeclimate]

Code Climate has analyzed commit ffdb01b and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 90.1% (0.0% change).

View more on Code Climate.