Fix tests for bar chart most recent number view
Fix tests for graph callout component
Fix tests for tooltip element
Fix delta component tests
Fix headline component tests
Add tests for Collection#mean method
Fix volumetrics number module tests
Fix controller event tests
Fix collection tests

Remove fetchParts tests since these methods don't exist anymore.

Update selectItem tests to reflect additional options
Fix single-stat view tests
Fix bar chart x-axis tests following matrix collection removal
Fix journey callout tests following matrix collection removal
Remove file that is referenced nowhere
Renamed interleaved bar to simply "bar"
Fix tests for bar chart bar component following matrix collection removal