Include device lab version for how to run test (#163010)

No bug adding to documentation. 

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

Author: reidbaker

dev/integration_tests/display_cutout_rotation/README.md

@@ -1,3 +1,5 @@
 # display_cutout_rotation
 
 To run test locally use `flutter drive integration_test/display_cutout_test.dart` from this folder.
+
+OR from `flutter/dev/devicelab` run `dart bin/test_runner.dart test -t android_display_cutout`.