Do not show a deprecation warning if cross-project duplication is overridden and disabled at project level

Cross-project duplication detection is a deprecated feature. Hence, when it is used, we show a warning in the scanner logs, as well as on the project overview:

2020.04.09 11:27:09 WARN  ce[AXFesZCYLxAOY0gNscTA][o.s.c.t.p.d.IntegrateCrossProjectDuplications] This analysis uses the deprecated cross-project duplication feature.
2020.04.09 11:27:09 INFO  ce[AXFesZCYLxAOY0gNscTA][o.s.c.t.s.ComputationStepExecutor] Compute cross project duplications | status=SUCCESS | time=135ms

This can be activated at the global level, which will enable it for all projects. However, we can override this per project. When cross-project duplication is activated at global level, but deactivated at project level, SonarQube still issues a depreciation warning for the analyzed project. This is incorrect, as the duplication is indeed not being computed for this project. We should not show these warnings in these cases.