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test/fuzz: unblock tests after fixing UBSan

Previously, fuzzing tests that depend on LuaJIT were disabled in
a build with enabled UndefinedBehaviour Sanitizer because UBsan
was unsupported in LuaJIT. The commit bf01fb200777
("luajit: bump new version") introduced the LUAJIT_USE_UBSAN
option in LuaJIT. It's a good time to unblock fuzzing tests
disabled before.

CMake option `ENABLE_FUZZER` and macros
`FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION` have been removed from
`CMAKE_PARAMS_ASAN` in .test.mk, because unblocked `sql_fuzzer`
requires enabling `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION`, but
this macros changes SQL source code and breaks regression tests,
see commit 67c737964c82 ("sql: make sql code fuzzing-friendly").
Initially, CMake option `ENABLE_FUZZER` was enabled there
to check that building of fuzzing tests is not broken,
tests itself executed in a separate workflow.

Closes #10145
Follows up #8473
Related to #10228

NO_CHANGELOG=fuzzing
NO_DOC=fuzzing
NO_TEST=fuzzing

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