test: fix failing tests and API (#5823)

* tests: fix failing tests

* fix selection.test.tsx

* fix excalidraw.test.tsx and don't show image export when SaveAsImage is false in UIOptions.canvasActions

* more fixes

* require fake index db in setUp test to fix the tests

* fix regression

src/tests/queries/toolQueries.ts

@@ -10,6 +10,7 @@ const toolMap = {
   line: "line",
   freedraw: "freedraw",
   text: "text",
+  eraser: "eraser",
 };
 
 export type ToolName = keyof typeof toolMap;