feat(activity-logs): Incremental cache refresh task

[yasen-posthog]

Problem

• We currently have the refresh_activity_log_fields_cache task which runs every 12h to recalculate the filterable fields on the activity logs of large orgs (>20k records). However, this recalculates the whole cache from scratch. This doesn't make much sense because the log records are immutable and no new fields will be discovered if we keep recalculating on the same records.

Changes

• Changes the task to recalculate on the last 14h only (runs each 12h + 2h buffer for delayed tasks).
• Adds a --flushed and --hours-back to the python manage.py refresh_activity_log_fields_cache command which is a wrapper around the task code. Can be used to manually recalc the cache, incrementally or from scratch, and can be done on a custom timeframe if needed.

[greptile-apps]

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