Add filter for allowing custom triggers to be added in Bricks Abilities Interactions

Currently the triggers that are in Bricks\Abilities\Interactions is a hardcoded list of the default interaction triggers.

We’re adding custom interactions to Bricks, but this list not having a filter means we’re currently unable to add these interactions to elements via the new MCP connection, only through the builder UI.

if there could be a filter added to add more to this list, that would be ideal.

(similar to the bricks/abilities/element_conditions/allowed_keys for conditions)