New advancement "Birthday Song" grants no experience

Relates to MC-249782. The new advancement "Birthday Song" is designated as a challenge advancement (the ones with the sound effect with audible experience) but it grants no experience. This is inconsistant with all other challenge advancements, and is an oversight. The bug is either that these advancements shouldn't be challenges, or that they should grant experience.

Steps to Reproduce:

/advancement grant @s only minecraft:husbandry/allay_deliver_cake_to_note_block