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test/fuzz: disable error injections on teardown

`test_engine.lua` actively uses error injections. Sometimes
error injections remain enabled and triggered on test teardown.
This leads to false positive test fails like below:

NO_WRAP
2024-09-10 12:38:42.317 [1305] main/3502/WRK #3387/..test.fuzz.lua.test_engine I> Worker #3387 has finished.
2024-09-10 12:38:47.167 [1305] main/104/test_engine.lua/..test.fuzz.lua.test_engine I> TEARDOWN
2024-09-10 12:38:47.171 [1305] main/104/test_engine.lua wal.c:1327 E> ER_WAL_IO: Failed to write to disk
2024-09-10 12:38:47.174 [1305] main test_engine.lua:564 E> ER_WAL_IO: Failed to write to disk
2024-09-10 12:38:47.174 [1305] main F> fatal error, exiting the event loop
NO_WRAP

The patch disables error injection at the beginning of teardown.

NO_CHANGELOG=testing
NO_DOC=testing

(cherry picked from commit be709c63b)

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