delete UI tests that only check internal implementation details of thread-locals

Author: joboet

src/tools/tidy/src/issues.txt

@@ -4007,8 +4007,6 @@
 "ui/test-attrs/issue-53675-a-test-called-panic.rs",
 "ui/threads-sendsync/issue-24313.rs",
 "ui/threads-sendsync/issue-29488.rs",
-"ui/threads-sendsync/issue-43733-2.rs",
-"ui/threads-sendsync/issue-43733.rs",
 "ui/threads-sendsync/issue-4446.rs",
 "ui/threads-sendsync/issue-4448.rs",
 "ui/threads-sendsync/issue-8827.rs",