Render dict[str, bool] block input as collapsible multi-select

[Pwuts]

• Part of Implement GitHub "on pull request" block #8352

PR #8358 adds at least one block with an event filter input:

This is ugly and impractical. To fix this, it should be rendered as a multi-select dropdown (example):

To generalize this to how we render inputs in general:
an object input on a block should be rendered as a multi-select dropdown if all of its sub-inputs are booleans and it has 3 or more sub-inputs.

[Pwuts]

dd446a7

[Pwuts]

Technically this is implemented now, but the NodeMultiSelectInput doesn't yet behave like it should. Clicking on an item doesn't add it to the selection. Outside of the node, e.g. on the agent submission page, this does work. I'm guessing there is some custom click event handling going on that makes it not work, but idk.

Selecting an item using my arrow keys + enter works, so the way the component is integrated doesn't seem to be the issue.