Save copilot-warning-16.svg, copilot-error-16.svg (#962)

* Save copilot-warning-16.svg, copilot-error-16.svg

* Create large-cameras-accept.md

* Optimize SVGs

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Co-authored-by: Cameron Foxly <[email protected]>

Author: CameronFoxly

.changeset/large-cameras-accept.md

@@ -0,0 +1,5 @@
+---
+"@primer/octicons": minor
+---
+
+Edited small details on `copilot-warning` and `copilot-error` to maintain consistency with the rest of the copilot icon set.