Dependency graph - change arrows (final)

Final modification to arrow direction, it makes more sense and is more coherent with the search to / from when arrows go from the target to the parent as shown in the 'Expected' below:

To implement:

• Make arrows from the children point to the parent BR-01 <- FN-01 <- TECH-001

• Make arrows from Jira point to the requirement BR-01 <- JIRA-001