Add field links to the release pressure metric
This link would open https://gitlab.com/groups/gitlab-org/-/merge_requests?scope=all&utf8=%E2%9C%93&state=merged&label_name[]=Pick%20into%2013.8 for example.
Test dashboard: https://dashboards.gitlab.net/dashboard/snapshot/FKNP7q1B29L8sCHywyNOZmT6LWh2OvJa