Add total hours to reports

[dmtrek14]

This PR adds total hours to two existing report: viewUserDetails and userTaskReport.

Main changes include:

• Add a grid footer where we will place the total
• On store load, append data total to the footer
• Style the footer
• Change the grid type in the userTasksReport from simple grid panel to ExportableGridPanel
• Update the ExportableGridPanel to export the total row to the csv if it is present in the grid

I forgot to turn on my 'format on save' in VSCodium, so it appears there are a lot of changes to userTasksReport. The actual code changes are at:

• Lines 423-428: add function to get minutes and variable to hold the total string
• Lines 442-454: add listener for load of store and append total hours to the footer
• Line 524: change the type of grid panel
• Line 550: add the style for the footer, remove the previous 'download as csv' button.

For this last change, the button is removed because I changed the grid panel type to ExportableGridPanel which already has the button in the component.

[anarute]

LGTM! I tested locally and it works fine, thanks!