Adding the ArrowDiagonal icon (#11639)

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### WHY are these changes introduced?

Fixes #11638 

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### WHAT is this pull request doing?

Adding the new ArrowDiagonal icon

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### How to 🎩

🖥 [Local development
instructions](https://github.com/Shopify/polaris/blob/main/README.md#install-dependencies-and-build-workspaces)
🗒 [General tophatting
guidelines](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md)
📄 [Changelog
guidelines](https://github.com/Shopify/polaris/blob/main/.github/CONTRIBUTING.md#changelog)

### 🎩 checklist

- [x] Tested a
[snapshot](https://github.com/Shopify/polaris/blob/main/documentation/Releasing.md#-snapshot-releases)
- [x] Tested on
[mobile](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting.md#cross-browser-testing)
- [x] Tested on [multiple
browsers](https://help.shopify.com/en/manual/shopify-admin/supported-browsers)
- [x] Tested for
[accessibility](https://github.com/Shopify/polaris/blob/main/documentation/Accessibility%20testing.md)
- [x] Updated the component's `README.md` with documentation changes
- [x] [Tophatted
documentation](https://github.com/Shopify/polaris/blob/main/documentation/Tophatting%20documentation.md)
changes in the style guide

---------

Co-authored-by: kyledurand <[email protected]>

Author: ardakaracizmeli

.changeset/mighty-dragons-agree.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris-icons': minor
+---
+
+Added a new icon: ArrowDiagonal

polaris-icons/icons/ArrowDiagonalIcon.svg

@@ -0,0 +1,9 @@
+name: Arrow diagonal
+description: Used to denote that associated text will be inserted
+keywords:
+  - arrow
+  - diagonal
+authors:
+  - Arda Karacizmeli
+date_added: 2024-02-22
+date_modified: 2024-02-22