Add myself as an owner for debug-helper and v8windbg

Change-Id: I65ed798968b602891e7f8d13c08c9065ab58d6d7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2418367Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#70031}

test/cctest/OWNERS

 per-file *profile*=alph@chromium.org
+per-file test-debug-helper.cc=seth.brenith@microsoft.com
+per-file test-v8windbg.cc=seth.brenith@microsoft.com

tools/debug_helper/OWNERS

+seth.brenith@microsoft.com

tools/v8windbg/OWNERS

+seth.brenith@microsoft.com