[Feature] Add "Average" Cards to dashboard

[apkuki]

Pre-work

• I have searched open and closed feature request to make sure this or similar feature request does not already exist.
• I have reviewed the milestones to ensure that this feature request, or a similar one, has not already been proposed.
• I agree to follow this project's Code of Conduct.

Which part of the application does your feature belong to?

Web UI/UX

Description

Currently Dashboard shows total tests, total completed and total failed as cards. To have an overview not only about the tests and the information from the last test it would be nice having three additional cards for

• Average download (all tests)
• Average upload (all tests)
• Average Ping (all tests)

Best case right below the test, but above the "last test" section.

this gives the opportunity to directly see in one glance if the latest test is somehow badly below the all tests average or if it fits right in.

[alexjustesen]

@apkuki can you take a peak at #2578 and let me know your thoughts on the screenshots of the new charts/stats?

[apkuki]

Wow that looks awesome - much better idea, solve it like this than with additional "average cards".

As a user this gives me a comprehensive overview in one glance on all my current and also "historic" average values.