MR dependency - MR should display all the MRs it blocks

Problem to solve

Currently when using MR dependency, in the dependent MR, user can see which MRs it depends on;

However, in the dependency MR, there is no such place to view all the MRs it blocks.

Displaying such Blocked merge requests provides user a good overview of all the related MRs, especially for example in the following relationship:

graph TD;
    labkit-->gitaly;
    labkit-->gitlab-pages;
    labkit-->gitlab-workhorse;

Proposal

Similar to issue - linked items - blocks part, consider adding a section Blocked merge requests in the MR detail page.