Fix flappiness case of test_gen_server:test_timeout_info/0
#2023
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Instead of using computed sleep times which CI doesn't like, implement a callback mechanism to test that indeed timeout messages are sent.
Also fix
test_start_name/0so it doesn't leave an unprocessedEXITmessage if trap_exit flag was true.These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).
SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later