Show actual commit count on project dashboard

What does this MR do?

Instead of displaying the rounded commit count this shows the actual commit count on the project dashboard. Also added the number_with_delimiter helper to show the numbers in a nice, human-readable format.

Why was this MR needed?

The rounded commit count is great for a quick display of the commits, such as for the public project list. However, for the dashboard it is overly simplified. When a project has between 1,000 and 5,000 commits you just see '1000+ commits'. There is no reason we shouldn't show the complete commit count here.

Screenshots

Before:

After: