Small fix: avoid leaving files after tests run

Description

Problem: after I run tests, I constantly get Sample.tz and Sample2.tz files appearing as unstaged in git status.

Solution: normally tests should not leave any files, maybe except for in the temp directory.

Here we rather check that files are created and simultaneously delete them.

Also applied some minor refactoring, namely to avoid using Control.Exception and use try and throwM from Prelude's (which re-exports methods from exceptions-safe package). This is pretty actual here since we don't want to catch user interrupts and other async exceptions, rather only exceptions related to the current test suite.

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