Update plugin icon and banner assets

[shaunandrews]

A new Icon and Banner for the AI plugin. We'll also be using this same visual treatment for a callout on the new Connectors screen in WordPress 7.0

Preview

Banner (772×250)

Icon (256×256)

Here's what this would look like on the new Connectors screen:

[github-actions]

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Co-authored-by: shaunandrews <shaunandrews@git.wordpress.org>
Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>
Co-authored-by: juanfra <juanfra@git.wordpress.org>

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[jeffpaul]

@shaunandrews not sure how much it matters, but the current beaker version presents as 256x256 and the new bits version presents as 128x128.

[juanfra]

I believe the size shouldn't affect display since it's svg, though keeping it at 256x256 for consistency might be worth it.

[shaunandrews]

Gotcha. I just pushed an updated SVG.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.03%. Comparing base (9e88ddc) to head (c803f5f).
⚠️ Report is 29 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #288      +/-   ##
=============================================
+ Coverage      57.72%   58.03%   +0.31%     
- Complexity       567      576       +9     
=============================================
  Files             36       37       +1     
  Lines           2933     2955      +22     
=============================================
+ Hits            1693     1715      +22     
  Misses          1240     1240              

Flag	Coverage Δ
unit	58.03% <ø> (+0.31%)	⬆️

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