test: move application tests to tests/

test_support/test_helpers -> tests/support; watched_at unified w/ domain test_watched_at (2024-03-15).
Kept inline: users::diary_filter tests (feed_sort_to_direction_all_variants, paged_user_filter_builds_correctly) - pub(super) helpers in private module.
Dropped stale never-compiled users/tests/get_users.rs (old execute signature).

crates/application/tests/movies.rs

@@ -0,0 +1,12 @@
+mod support;
+
+#[path = "movies/enrich_movie_test.rs"]
+mod enrich_movie_test;
+#[path = "movies/get_movie_profile_test.rs"]
+mod get_movie_profile_test;
+#[path = "movies/get_movies_test.rs"]
+mod get_movies_test;
+#[path = "movies/request_enrichment_test.rs"]
+mod request_enrichment_test;
+#[path = "movies/sync_poster_test.rs"]
+mod sync_poster_test;