Attempt to fix flakey windows tests in ci (#1337)

- Eg
https://github.com/cursorless-dev/cursorless/actions/runs/4479616153/jobs/7873791164
- Applying workaround proposed in
microsoft/vscode#130414 (comment)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

packages/test-harness/src/util/launchVscodeAndRunTests.ts

@@ -44,6 +44,8 @@ export async function launchVscodeAndRunTests(extensionTestsPath: string) {
       cli,
       [
         ...args,
+        "--disable-gpu",
+        "--disable-software-rasterizer",
         ...extensionDependencies.flatMap((dependency) => [
           "--install-extension",
           dependency,