Create separate job for uploading frontend coverage paths

What does this MR do and why?

• Fixes issue with uploading frontend coverage paths in Scheduled master pipeline by fixing the rake task name and creating a new job definition.
• BABEL_ENV was not being correctly set in compile-test-assets job. Adding a condition in rules.gitlab-ci.yml.

Note: This change does not impact MR pipelines.

References

Relates to gitlab-org/quality/quality-engineering/team-tasks#3582 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

Here is the job from test MR to test the changes: https://gitlab.com/gitlab-org/gitlab/-/jobs/10157246179

MR acceptance checklist

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