Currently, `estimated_pending_compactions` uses a precalculated value
calculated by `update_estimated_compaction_by_tasks`, which, in turn,
is called by `get_compaction_candidates`. That means that, if
`estimated_pending_compactions` is called, e.g. right after
major compaction, it will return an outdated value that was
calculated prior to major compaction, and so, it is no longer
relevant.
Instead, just recalculate the value in `estimated_pending_compactions`
and drop `update_estimated_compaction_by_tasks`.
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
284dbc51c3