[Dashboard] Start the new dashboard (#10131)

* Use new dashboard if environment var RAY_USE_NEW_DASHBOARD exists; new dashboard startup

* Make fake client/build/static directory for dashboard

* Add test_dashboard.py for new dashboard

* Travis CI enable new dashboard test

* Update new dashboard

* Agent manager service

* Add agent manager

* Register agent to agent manager

* Add a new line to the end of agent_manager.cc

* Fix merge; Fix lint

* Update dashboard/agent.py

Co-authored-by: SangBin Cho <rkooo567@gmail.com>

* Update dashboard/head.py

Co-authored-by: SangBin Cho <rkooo567@gmail.com>

* Fix bug

* Add tests for dashboard

* Fix

* Remove const from Process::Kill() & Fix bugs

* Revert error check of execute_after

* Raise exception from DashboardAgent.run

* Add more tests.

* Fix compile on Linux

* Use dict comprehension instead of dict(generator)

* Fix lint

* Fix windows compile

* Fix lint

* Test Windows CI

* Revert "Test Windows CI"

This reverts commit 945e01051ec95cff5fcc1c0bc37045b46e7ad9a6.

* Fix ParseWindowsCommandLine bug

* Update src/ray/util/util.cc

Co-authored-by: Robert Nishihara <robertnishihara@gmail.com>

Co-authored-by: 刘宝 <po.lb@antfin.com>
Co-authored-by: SangBin Cho <rkooo567@gmail.com>
Co-authored-by: Robert Nishihara <robertnishihara@gmail.com>

python/ray/node.py

@@ -615,8 +615,11 @@ class Node:
                 if we fail to start the dashboard. Otherwise it will print
                 a warning if we fail to start the dashboard.
         """
-        stdout_file, stderr_file = self.get_log_file_handles(
-            "dashboard", unique=True)
+        if "RAY_USE_NEW_DASHBOARD" in os.environ:
+            stdout_file, stderr_file = None, None
+        else:
+            stdout_file, stderr_file = self.get_log_file_handles(
+                "dashboard", unique=True)
         self._webui_url, process_info = ray.services.start_dashboard(
             require_dashboard,
             self._ray_params.dashboard_host,
@@ -797,7 +800,8 @@ class Node:
 
         self.start_plasma_store()
         self.start_raylet()
-        self.start_reporter()
+        if "RAY_USE_NEW_DASHBOARD" not in os.environ:
+            self.start_reporter()
 
         if self._ray_params.include_log_monitor:
             self.start_log_monitor()