fix: handle tokenizer error in config file

[MarkoMin]

The problem was that tokenizer returned a tuple {1, {erl_scan, {illegel, integer}}} tuple which was converted to a list but ~ts in io_lib:format required unicode and string modules.

Also, tokenizer error is now matched to embed line number correctly. I assume that tokenizer can't return eof when being run without continuation as first param so I didn't match that clause.

Error message you'll get for sys.config that contains 7k is the following:

Could not start kernel pid (application_controller) ("error in config file \"/tmp/sys.config\" (1): {erl_scan,{illegal,integer}}")

I tried testing this in the application_controller_SUITE but with no success - I tried starting slave node and match on error message, but I only got timeout. Anyone got an idea on how to test this?

Submitting fix to master branch because it occurred after in OTP28.

Ping @eproxus

Props to @richcarl for posting hints on what's going on.

Closes #10214

[github-actions]

CT Test Results

    2 files     72 suites   1h 9m 47s ⏱️
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1 937 runs  1 535 ✅ 402 💤 0 ❌

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