Commits on Oct 6, 2023

1. Save artifacts only once …

   Since commit [1] the `Server:save_artifacts()` function was called more
   than once. Due to this fact we could overwrite already saved artifacts.
   Added a flag that will ensure that the saving will be executed only
   once.
   
   There was also a problem when copying artifacts was not performed but
   the path to the artifacts was formed as a directory with artifacts:
   
       artifacts:
           server -> /tmp/t/artifacts/server-XXX
   
   And if we tried to look at these artifacts, we could see this:
   
       $ ls -la /tmp/t/artifacts/server-XXX
       ls: cannot access '/tmp/t/artifacts/server-XXX': No such file or
       directory
   
   To show explicitly that the saving failed with an error, the following
   string will now be written to the artifacts:
   
       artifacts:
           server -> Failed to copy artifacts for server (alias: server-XXX
           workdir: /tmp/t/artifacts/server-XXX)
   
   [1] tarantool/luatest@251b35f
   
   Part of tarantool#304

   Oleg Chaplashkin committed Oct 6, 2023
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