Refactor board activites to filter by board id

[juliusknorr]

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The activity app onyl allows fetching by object_type and object_id

https://github.com/nextcloud/activity/blob/dee03c7f5ca2d201b5c204c1bdde4b15bb640258/lib/Controller/APIv2.php#L208

Currently all card activities are fetched and filtered by board in the frontend.

https://github.com/nextcloud/deck/blob/f3b5fd4030dd04985a87ec7cca8cd1fc488fb781/lib/Activity/ActivityManager.php#L61-L62

A possible way to improve this would be to also create an activity for the object_type board for all card actions.

https://github.com/nextcloud/deck/blob/f3b5fd4030dd04985a87ec7cca8cd1fc488fb781/lib/Activity/ActivityManager.php#L304

Probably also needs some adjustments on the parameters that get replaced: https://github.com/nextcloud/deck/blob/f18accd9c44fa82dee49e62ed3695f8b151000f8/lib/Activity/DeckProvider.php#L121

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