lib_base/unix/test: migrate unix error encodings tests from alcotest to tezt

Vivien Pelletierrequested to merge
nomadic-labs/tezos:vivien@lib-base_migrate-from-alcotest2tezt_unix-test-error into master

What

In the effort to migrate alcotest tests to tezt, this MR migrates unix error encoding tests. Tezt tags are added to regroup all lib_base, unix and encodings tests.

Why

How

Manually testing the MR

dune exec src/lib_base/unix/test/main.exe -- --file test_unix_error.ml

Checklist

  • Document the interface of any function added or modified (see the coding guidelines)
  • Document any change to the user interface, including configuration parameters (see node configuration)
  • Provide automatic testing (see the testing guide).
  • For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
  • Select suitable reviewers using the Reviewers field below.
  • Select as Assignee the next person who should take action on that MR

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