The previous implementation used delete + create on every async_setup_entry,
which reset dismissed_version and forced the issue to reappear after every
HA restart regardless of whether the user had dismissed it.
Fix: use async_create_issue (internally get-or-create, preserves
dismissed_version when params are unchanged) instead of delete + create.
The options flow still uses delete + create when the mode changes again,
ensuring the issue is forced into view for any new change.
Also auto-clear the DATA_STATISTICS_REVIEW_REQUIRED flag from
config_entry.data when the issue is detected as dismissed on setup,
so the flag does not linger indefinitely after the user has acknowledged
the issue.
Released-Bug: no
5b5d5e73b0