DEVPROD-14995: remove check for number of task directories that fail to clean up

[Kimchelly]

DEVPROD-14995

Description

After looking at some hosts in prod, it seems like the agent unfortunately fails to clean up task directories pretty often on static hosts. While failing to clean up the task directory a few times should warrant a quarantine, it's more work to manage the more frequent quarantines (and I believe fixing the underlying task directory cleanup issue isn't that easy).

To make quarantines less frequent, I reduced the data directory health check to just see how much disk space is remaining, which is the most important thing when deciding whether or not to run the next task.

Testing

Existing tests pass.

[ZackarySantana]

LGTM! What change did you do for

To make quarantines less frequent, I reduced the data directory health check to just see how much disk space is remaining, which is the most important thing when deciding whether or not to run the next task.
?

[Kimchelly]

The disk space check was #8801. That one is still likely useful and I left it as-is.