chore: disable warnings in old CI (#4691)

tests-build/tests/pass/forward_args_and_output.rs

@@ -1,13 +0,0 @@
-use tests_build::tokio;
-
-fn main() {}
-
-// arguments and output type is forwarded so other macros can access them
-
-#[tokio::test]
-async fn test_fn_has_args(_x: u8) {}
-
-#[tokio::test]
-async fn test_has_output() -> Result<(), Box<dyn std::error::Error>> {
-    Ok(())
-}

tests-build/tests/pass/macros_main_loop.rs

@@ -1,14 +0,0 @@
-use tests_build::tokio;
-
-#[tokio::main]
-async fn main() -> Result<(), ()> {
-    loop {
-        if !never() {
-            return Ok(());
-        }
-    }
-}
-
-fn never() -> bool {
-    std::time::Instant::now() > std::time::Instant::now()
-}

tests-build/tests/pass/macros_main_return.rs

@@ -1,6 +0,0 @@
-use tests_build::tokio;
-
-#[tokio::main]
-async fn main() -> Result<(), ()> {
-    return Ok(());
-}