ignore beta/stable channels on rust-lld-by-default test

Signed-off-by: onur-ozkan <[email protected]>

Author: onur-ozkan

tests/run-make/rust-lld-by-default/rmake.rs

@@ -2,6 +2,8 @@
 // also be turned off with a CLI flag.
 
 //@ needs-rust-lld
+//@ ignore-beta
+//@ ignore-stable
 //@ only-x86_64-unknown-linux-gnu
 
 use run_make_support::regex::Regex;