[CI] Properly integrate the mocha integration tests Junit reports with CI

Summary: Similar to D17990 but for the integration tests.

Test Plan:

./contrib/teamcity/build-configurations.py ecash-lib-integration-tests

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D17991