Fixes for test results for issues found when deploying

Fixes for the following problems found after deploying https://lab.nexedi.com/nexedi/erp5/merge_requests/924 :

1. list of test result lines needs to show failed tests first (it was apparently a local change we lost)
2. TestResult_getTestSuiteData was failing on some production data. Note that it still fail for test suites where a test suite repository does not have a buildout section id, but this property is supposed to be mandatory. If that cause error, I think we should just fix the test suites instead.
3. gitlab API does not support repository names nexedi%2Fslapos.core . It would support nexedi%2Fslapos%2Ecore but requests does not allow that.
4. Test results URL are the old UI, we want ERP5JS