Cache quote related backports

Tristan Van Berkomrequested to merge
tristan/platform-cache-quota-1.2 into bst-1.2

This merge request backports a few things:

  • Jürg's housecleaning branch which separates the artifact cache from the platform (!829 (merged))
  • The insufficient disk space errors (!1102 (merged)), this ensures that we error out with a comprehensive message when the user requests an unsensible cache quota
  • Logging improvements to display current cache usage in the heading, status bar and when it changes (!1105 (merged))

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