Summary:
Our `src/ui` bazel rules are some janky handcrafted rules.
This makes sure that the test xml output and the coverage output are where bazel expects them to be instead of in `TEST_UNDECLARED_OUTPUTS_DIR`.

Other fixes are based on changes to the coverage path.

Test Plan:
Build/test/coverage locally. Upload to codecov.
Jenkins.

Reviewers: zasgar

Reviewed By: zasgar

Subscribers: nlanam

Differential Revision: https://phab.corp.pixielabs.ai/D7803

GitOrigin-RevId: 6a13e83c956ef669bc2f8f210cdf10db2bb6d889