What has been done in this MR?

Fix #1903. The key info from the source given there: "Over the life of the familiar, the number of summoning points drained will be equal to the level required to summon the familiar (unless you run out of summoning points). This means that if a player summons a bunyip with 75 Summoning points remaining, 7 points will be drained immediately, and 61 more will be drained over the life the bunyip, for a total of 68 points (the level of the bunyip)."

What should testers check?

Check that it indeed drains as specified. I tested with a spirit tz-kih and ended up at the expected 99-22=77 summoning points left; please test with other familiars to see if I got the implementation right (it was trickier than I thought).

I have tested these changes thoroughly.
I used the relevant Zaros tool for any JSON edits where possible, and have attached screenshots of any changes.