feat(server, cache): credo — flag directives inside ExUnit block macros

Summary

Originally raised in https://github.com/tuist/tuist/pull/10878#discussion_r3273526712 — an alias inside a describe body slipped through review. We had Credo.Checks.DisallowDirectivesInFunction that catches import/alias/require inside def/defp, but it only ran on lib/ and only matched function definitions, so it never looked at ExUnit block macros.

What changed

• Check (tuist_common/credo/checks/disallow_directives_in_function.ex) — added a traversal clause for describe, test, setup, setup_all. When one is encountered the do: body is run through the same collect_directives/1 walk as def/defp bodies, and the existing quote skip still applies. Updated the moduledoc, explanation, and issue message to read “function or block body”.
• Configs — server/.credo.exs, cache/.credo.exs, and processor/.credo.exs now apply this check to test/ as well as lib/.
• Sweep — fixed the six pre-existing violations the broadened check surfaced:
  • server/test/support/tuist_test_support/fixtures/projects_fixtures.ex — import Ecto.Query lifted from project_fixture/1 to the module
  • server/test/tuist/tests_test.exs — import Ecto.Query lifted from a test to the module
  • server/test/tuist_web/live/test_run_live_test.exs — alias TuistTestSupport.Fixtures.CommandEventsFixtures lifted from a test to the module
  • cache/test/cache/registry/lock_test.exs — import ExUnit.CaptureLog lifted from a test to the module
  • cache/test/cache/sqlite_buffer_test.exs — two redundant import Ecto.Query inside test blocks removed (already imported at module level)

How to test locally

• cd server && mix credo --strict — passes, no DisallowDirectivesInFunction violations.
• cd cache && mix credo --strict — passes.
• Synthetic verification: dropped a one-off _sample_check_test.exs with alias inside describe/setup/test and confirmed the check reports all three sites.
• Re-ran the touched tests:
  • cd cache && mix test test/cache/registry/lock_test.exs test/cache/sqlite_buffer_test.exs — 27/27 pass
  • cd server && mix test test/tuist/tests_test.exs:2110 test/tuist_web/live/test_run_live_test.exs — 16/16 pass
• mix format --check-formatted is clean on every touched file.

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