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test: extend fiber slice in mvcc_func_index_test

The test fails way too often on aarch64 runners:

```
[064] not ok 11	box-luatest.mvcc_func_index.test_no_function_call_on_non_func_read
[064] #   fiber slice is exceeded
[064] #   stack traceback:
[064] #   	builtin/box/schema.lua:2439: in function 'select'
[064] #   	...tool/tarantool/test/box-luatest/mvcc_func_index_test.lua:446: in function <...tool/tarantool/test/box-luatest/mvcc_func_index_test.lua:405>
[064] #   	...tool/tarantool/test/box-luatest/mvcc_func_index_test.lua:405: in function 'box-luatest.mvcc_func_index.test_no_function_call_on_non_func_read'
```

Fix it by extending the fiber slice before the long loop.

Closes #12444

NO_DOC=test fix
NO_CHANGELOG=test fix

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