Add deprecated note to run_test_suite.py
Add deprecated note to run_test_suite.py

Bug: chromium:1186163
Change-Id: I03a271c232f1f4fdf9f33682d75520f39b593af1
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3121429
Reviewed-by: Kim-Anh Tran <a72f38a79b5fac6811022b8a7fb84830d856c9c9@chromium.org>
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

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