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Fix reporting of an error during error handling.

Reported by Sergey Kaplun.

(cherry picked from commit 54a162688)

For now, any non-ERRRUN error in the error handling preserves its own
error message. Thus, instead of the 'error in error handling', the
caller gets an 'out of memory' or 'stack overflow' error.

This patch adds the corresponding status check in the custom error
handlers. The "error in error handling" string is also added to the
preallocated strings to avoid OOM during error message allocation.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#12134

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