[core] Remove leftover code from the import thread. Deprecate the ray config RAY_start_python_importer_thread #44036
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In #36293 the import_thread is removed. However there are some code leftovers and may fail if a remote function load is not done in time. This PR removes the remnant code for it. Also deprecated the
RAY_start_python_importer_thread
config.Note: in
function_manager.py
there's a recursive lock which may not be needed anymore. But to be safe I did not remove it. Need some more auditing on the lock.Fixes #44031.
Signed-off-by: Ruiyang Wang rywang014@gmail.com