[Icons] Adds 4 new icons with new shapes #12449
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Closes #12010
Closes #12011
Closes #12012
Closes #12013
WHY are these changes introduced?
This adds 4 new icons to Polaris to represent shapes.
Icon Figma link
https://www.figma.com/design/x3mlbLESgBoqQrUAHz570E/Editor-improvements?node-id=436%3A35753&t=GWGMqbgUPWaGJAJk-1
WHAT is this pull request doing?
Adding icons
🎩 checklist
README.md
with documentation changes