Links from failed integrations in gerrit should have branch value in URL

Currently, the link from failed integration displayed as gerrit refers to Fast Check dashboard, that originally was designed to be used only in dev (in order to load data very fast).

Currently, there is a branch option. If somebody changes the branch and saves the dashboard with the value of its parameter - the dashboard can show data from that branch by default.

To make sure the link always points to data from the dev branch it should be modified and the var-branch=dev should be added.

QThread/Unix: fix normal exit/terminate() race (575205) · Gerrit Code Review (qt-project.org)

working case: 

misleading case (requires change of branch):
its misleading because the fail was in dev, and links can point to any saved branch, in this case 6.7

Note (the dashboard is in dev so you may not reproduce the issue when you open the ticket).

code to change can be found at https://codereview.qt-project.org/c/qtqa/tqtc-coin-ci/+/390560/4/src/services/publisher/gerrit.go