console: fix :endswith() err in tntctl connection
There used to be a rare error when failed to connect via tarantoolctl to listening cartridge console. It was caused by unclear console.local_print() contract. Starting from gh-7031 fix, the function assumed string-only arguments, while in some cases cdata error was passed.
Now console.local_print() prints all non-string arguments as is, without modifying potential local_eos.
Closes #8374
NO_DOC=bugfix NO_TEST=very hard to test