* upstream/master: (889 commits)
SlackService - respect `notify_only_default_branch` for push events
Clarify usage ping wording in admin area
Update incoming emails documents
Allow to include also descendant group labels
Update docs on grouping CI jobs
Support additional LabelsFinder parameters for group labels
Extend Cluster Applications to install GitLab Runner to Kubernetes cluster
Remove registry list webpack entry point
Remove trailing newline that was causing an EE conflict
Small fixes in Vuex docs
Remove u2f webpack bundle
Update documentation WRT to request parameters
remove common_vue CommonsChunk config
Fetch commit signatures from Gitaly in batches
migrate stl_viewer to dynamic import
migrate sketch_viewer to dynamic import
migrate pdf_viewer to dynamic import
migrate notebook_viewer to dynamic import
migrate balsamiq_viewer to dynamic import
Add some strings that were missing in gitlab.pot
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