Pasting valid Gutenberg block markup throws a "unexpected or invalid mark-up" error

### Describe the bug:

I should be able to paste some valid Gutenberg block-markup into the editor without it erroring.

### To reproduce:

1. Install co-blocks (can't reproduce without)
2. Open the post editor
3. Paste the following, completely valid mark-up (or insert a pattern with the same):

```

Summer
Vibe

```
5. See "This block contains unexpected or invalid content." message

The problem isn't limited to heading blocks, the same happens for paragraphs too (and probably more).

### Expected behavior:

I expected a Heading block to be inserted without any mention of unexpected errors.

### Screenshots:


Console output says:
```
Block validation: Block validation failed for `core/heading` (
Object { name: "core/heading", icon: {…}, keywords: (2) […], attributes: {…}, providesContext: {}, usesContext: [], supports: {…}, styles: [], variations: [], save: heading_save_save(_ref)
, … }
).

Content generated by `save` function:

Summer
Vibe

Content retrieved from post body:

Summer
Vibe

```

I think [applyStyle](https://github.com/godaddy-wordpress/coblocks/blob/master/src/extensions/typography/apply-style.js#L14) is taking the fontFamily block attribute and putting it into the style prop, even though that's not necessary in Core.

### Isolating the problem:

- [x] This bug happens with no other plugins activated
- [x] This bug happens with a default WordPress theme active (can repro with TT3 and non-default themes)
- [x] This bug happens **without** the Gutenberg plugin active (can also repro with gutenberg trunk)
- [x] I can reproduce this bug consistently using the steps above

### WordPress version:

6.2

### Gutenberg version:

Either trunk at the time of writing, GB1.15 or whatever WP6.2 ships.