[Report] Browser statistics on dashboard

[martingrossmann]

Is your feature request related to a problem? Please describe.
For better overview about the used browser types in your test it would be nice to have some statistics on the dashboard

Describe the solution you'd like
The used browser type is stored in every session context. For statistics report have to iterate about all session contexts to create the statistics.
Is should presented as a table:

Browser	Used in tests	Created sessions
Chrome 95	20	20
Firefox 100	4	5

The statistics could be placed under "Failure corridor".

Additional context

• The browser usage should based on stored user agent, not on DesktopWebDriverRequest. It has to be checked if the user agent information are complete. I'm not sure if also platform type (Windows, Linux, Mac) can be determined.
• In most cases only one browser type is used. So the table is very smart.
• You can create more then one session in one test: Session count > test count
• You can create exclusive sessions: session count < test count. This should be noted for session count.