Fix IRC lines for blocks published with the old logging system

Fix IRC lines for blocks published with the old logging system

The CheckUser and GlobalBlocking extension are inserting the block logs
over the old logging system, where the keys are numeric.
This case is not known when building the irc line, because that was
already migrated to just get the new style.
Added compatibility code for legacy rows.

Needs the legacy flag also in ManualLogEntry to make this happen,
because it is using the LogFormatter of the new logging system to format
the actionText.

Have not found the old way for block/reblock, so just for block/block.

Bug: T92713
Follow-Up: Ibc7fcaa5a952ff90d42a6477da4baa429f3de64b
Change-Id: I08aea8399ce766e98c1a76e237169f220c6cc751