Disable `TaskProgress` dashboard component if there are too many task groups

[hendrikmakait]

Problem

Updating the TaskProgress involves looping over all task groups, which may become prohibitively expensive if we have too many task groups:

Solution

We should disable this component based on some configurable threshold to avoid overwhelming the scheduler CPU.

[hendrikmakait]

Looking at the code more closely...why do we even iterate over the task groups instead of just keeping the aggregate counts on the prefix? We already keep accumulated counts in TaskPrefix.state_counts.

[hendrikmakait]

Closed as superseded by #8680.