Add grouping by repository

[fmontorsi-equinix]

Is your feature request related to a problem? Please describe.
I have repositories with complex CI pipelines that run many many jobs.
Gitactionboard will show 1 tile for each of these jobs. So e.g. to monitor 10 repos, I have 100 tiles displayed.That's a bit too much.

Describe the solution you'd like
I think it would be really useful to collapse all the jobs related to the same repository in a single tile on the web UI, in the event that the jobs are all green/successful. Getting to the individual job detail-level is useful only when there is a failure.

Describe alternatives you've considered
None

Additional context
Cannot provide screenshot because repos are private

[boring-cyborg]

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[sumanmaity1234]

I believe we should focus on a more flexible, configurable solution. Here's what I'm proposing:

1. Keep things as they are (no grouping).
2. Group by workflow within the same repository.
3. Group by repository.

For now, let's prioritise the first two options, and we can consider the third option for the future.

[danebert]

I would also be interested in this feature. The ability to group by workflow would make this board much more useful to me.