chore: Ignore build2/ when linting (facebook#21204)

.eslintignore

@@ -6,6 +6,9 @@ packages/react-art/npm/lib
 
 # Build products
 build/
+# TODO: Currently storing artifacts as `./build2` so that it doesn't conflict
+# with old build job. Remove once we migrate rest of build/test pipeline.
+build2/
 coverage/
 fixtures/
 scripts/bench/benchmarks/**/*.js
@@ -20,4 +23,4 @@ packages/react-devtools-extensions/shared/build
 packages/react-devtools-inline/dist
 packages/react-devtools-shell/dist
 packages/react-devtools-scheduling-profiler/dist
-packages/react-devtools-scheduling-profiler/static
+packages/react-devtools-scheduling-profiler/static