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/wrapup.rs

@@ -0,0 +1,16 @@
+mod support;
+
+#[path = "wrapup/compute_test.rs"]
+mod compute_test;
+#[path = "wrapup/delete_test.rs"]
+mod delete_test;
+#[path = "wrapup/generate_test.rs"]
+mod generate_test;
+#[path = "wrapup/get_ready_report_test.rs"]
+mod get_ready_report_test;
+#[path = "wrapup/get_wrapup_test.rs"]
+mod get_wrapup_test;
+#[path = "wrapup/handle_requested_test.rs"]
+mod handle_requested_test;
+#[path = "wrapup/list_wrapups_test.rs"]
+mod list_wrapups_test;