[Icon] Add PersonSegment (Shopify#11778)

### WHY are these changes introduced?

Adds `PersonSegment` icon for Customer Segments

### 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

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

---------

Co-authored-by: Sam Rose <[email protected]>

.changeset/sixty-sheep-double.md

@@ -0,0 +1,5 @@
+---
+'@shopify/polaris-icons': minor
+---
+
+Added `PersonSegment` icon

polaris-icons/icons/PersonSegmentIcon.yml

@@ -0,0 +1,12 @@
+name: Person segment
+description: Used for customer segments
+keywords:
+  - Person
+  - Customer
+  - Segments
+  - Customer Segment
+authors:
+  - Salma Amzil
+  - Joe Thomas
+date_added: 2024-04-22
+date_modified: 2024-04-22