[net-types] Temporarily disable ip::tests::test_ipv6_display

This CL disables the `test_ipv6_display` test because it fails on the
new toolchain. I will fix and re-enable it after the toolchain rolls.

The new toolchain includes rust-lang/rust#112606
which changes the way std formats IP addresses. The test asserts that
net-types formats the same way as std, hence the failure. After the
toolchain rolls, I will change net-types to match std.

Bug: 126927
Change-Id: Ie459a53094b958b752e75e5cf86baa6f55bdade6
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/873649
Fuchsia-Auto-Submit: Mitchell Kember <mkember@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Joshua Liebow-Feeser <joshlf@google.com>
Commit-Queue: Mitchell Kember <mkember@google.com>

Author: Mitchell Kember

src/connectivity/lib/net-types/src/ip.rs

@@ -3529,6 +3529,9 @@ mod tests {
     }
 
     #[test]
+    // TODO(fxbug.dev/129316): Temporarily disabled for toolchain roll.
+    // Change to match https://github.com/rust-lang/rust/pull/112606 and re-enable.
+    #[ignore]
     fn test_ipv6_display() {
         // Test that `addr` is formatted the same by our `Display` impl as by
         // the standard library's `Display` impl. Optionally test that it