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profilers: print user-friendly errors

Prior to this patch, there was no error-checking in profilers,
which resulted in raw Lua errors being reported in cases of
non-existing paths or corrupt file structures. This patch
makes use of the event reader module introduced in commit
df5a07218 ("profilers: introduce
event reader module") to add error handling, so all parsing
errors are now reported in a user-friendly manner.

Tool CLI flag tests are adapted correspondingly to error message
changes.

Resolves tarantool/tarantool#9217
Part of tarantool/tarantool#5994

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