Update jest to produce a junit report for tests

[kevinearls]

Signed-off-by: Kevin Earls kearls@redhat.com

Which problem is this PR solving?

• It would be useful to be able to produce a JUnit type report in CI when tests are run.

Short description of the changes

• Add a jest-junit reporter to packages/jaeger-ui/package.json to product a junit.xml report whenever tests are run.

[codecov]

Codecov Report

Merging #723 (e644de4) into master (30d5b94) will not change coverage.
The diff coverage is n/a.

❗ Current head e644de4 differs from pull request most recent head c66edae. Consider uploading reports for the commit c66edae to get more accurate results

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[yurishkuro]

What is the practical impact of this? Is there something new being printed in CI?

[kevinearls]

@yurishkuro When you run yarn test it creates a standard junit type report in packages/jaeger-ui/junit.xml