feat: add sort-slash icon (#1381)

dsmmcken · web-flow · commit 9a7b910f2075 · 2023-06-21T09:01:48.000-04:00
Adds `dhSortSlash` icon needed by #1380 ![image](https://github.com/deephaven/web-client-ui/assets/1576283/b56d4003-81c2-4c11-a36c-ceac5fa19bb1)
diff --git a/packages/icons/src/icons/sort-slash.svg b/packages/icons/src/icons/sort-slash.svg
@@ -0,0 +1,7 @@
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