BS-9395: try to launch tests with smaller pool size
BS-9391 : [6.3] Size of documentcontentmimetype column in document_mapping table is incompatible with the RFC

- Increase the size of the mime type for the document & the archived document to 255.
BS-9380: rewrite integration test as 3 unitary query tests
BS-9398: ignored temporarily randomly failing test
Merge branch '6.3.x' into MasterBugFixing

Conflicts:
	services/bonita-services-integration-tests/src/test/java/org/bonitasoft/engine/scheduler/impl/JobTest.java