[Telemetry] Introduce runGatewayCanBePingedRoutine

Introduce new chrome.os.diagnostics.runGatewayCanBePingedRoutine API
function to run the gateway can be pinged routine.

Bug: b:188897824
Test: unit_tests --gtest_filter="*Convert*"
Test: browser_tests --gtest_filter="*Telemetry*"
Test: Follow http://go/lacros-test-linux to run tests locally
Test: ./testing/xvfb.py build/lacros/test_runner.py \
      test out/lacros/unit_tests --gtest_filter="*TelemetryExtension*" \
      --ash-chrome-path ./out/lacros/ash_clang_x64/test_ash_chrome
Test: ./testing/xvfb.py build/lacros/test_runner.py \
      test out/lacros/lacros_chrome_browsertests \
      --gtest_filter="*TelemetryExtension*"
      --ash-chrome-path ./out/lacros/ash_clang_x64/test_ash_chrome

NOPRESUBMIT=True

Change-Id: I894bff2024e15c8ec613be23567d0b1876478cfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3905015
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Oleh Lamzin <lamzin@google.com>
Commit-Queue: Bastian Kersting <bkersting@google.com>
Reviewed-by: Roland Bock <rbock@google.com>
Cr-Commit-Position: refs/heads/main@{#1050155}