6723-New Thread Markdown broke

[lzach83]

Link to Issue

Closes: #6723

Description of Changes

• Simplified the useNotionPaste hook

"How We Fixed It"

• By removing the check and the manual manipulation of the Quill Delta
• Was doing too much and causes a check for the delta before it was populated

Test Plan

1. Goto create thread
2. Paste the following:
3. Copy this content

An h1 header
============

Paragraphs are separated by a blank line.

2nd paragraph. *Italic*, **bold**, and `monospace`. Itemized lists
look like:

  * this one
  * that one
  * the other one

Note that --- not considering the asterisk --- the actual text
content starts at 4-columns in.

> Block quotes are
> written like so.
>
> They can span multiple paragraphs,
> if you like.

Use 3 dashes for an em-dash. Use 2 dashes for ranges (ex., "it's all
in chapters 12--14"). Three dots ... will be converted to an ellipsis.
Unicode is supported. ☺

4. Paste this with keyboard (ctrl + v or cmd + v)
5. To ensure no regression do the same with the following Notion MD:

- [x]  Click anywhere and just start typing
- [ ]  Hit **/** to see all the types of content you can create - headers, videos, sub pages, etc.
- [ ]  Highlight any text, and use the menu that pops up to **style** *your* ~~writing~~ `however` [you](https://www.notion.so/product) like
- [ ]  See the **⋮⋮** to the left of this checkbox on hover? Click and drag to move this line
- [ ]  Explore the sidebar to your left

[Israellund]

LGTM!

[jnaviask]

Should go into 0.9.5.

[CowMuon]

Holy Cow, it does seem to do the thing!