[TEST][antlir2] Mark apt ubuntu-noble test as x86_64-only

Summary:
`fbcode//antlir/antlir2/features/apt/tests:test-bash-installed-ubuntu-noble` has never passed on aarch64 (0/5 runs) because Ubuntu Noble has no aarch64 packages — the deb snapshot suite for noble is declared `architectures = ["amd64"]`, so the apt transaction fails to resolve bash/dash/dpkg:

```
Error: while planning transaction
Caused by:
    there were one or more transaction errors: ["No such package found 'bash'", "No such package found 'dash'", "No such package found 'dpkg'"]
```

The noble-only restriction is already declared for the suite (`package_managers/deb/BUCK`), the OS record (`os/oses.bzl`) and the build appliance, but nothing constrained the test itself, so CI kept configuring it for arm64.

Constrain the noble alias to x86_64, mirroring the existing precedent in `features/rpm/tests/facebook/rpmcow/BUCK`. The debian-trixie variants are unaffected — trixie snapshots do carry arm64.

___

Test Plan:
Target is now skipped instead of failing on aarch64:
```
$ buck2 build --flagfile fbcode//mode/dev-nosan --config fbcode.arch=aarch64 --skip-incompatible-targets fbcode//antlir/antlir2/features/apt/tests:test-bash-installed-ubuntu-noble
Skipped 1 incompatible targets:
  fbcode//antlir/antlir2/features/apt/tests:test-bash-installed-ubuntu-noble (cfg:dev-linux-arm64-fbcode-platform010-aarch64-clang21-no-san#f6800fbffbd05e8b)
BUILD SUCCEEDED
```

Still builds on x86_64:
```
$ buck2 build --flagfile fbcode//mode/dev-nosan fbcode//antlir/antlir2/features/apt/tests:test-bash-installed-ubuntu-noble
BUILD SUCCEEDED
```

Differential Revision: D117174803

fbshipit-source-id: 38760f7cafac1ad487826a54f2cce89a89f88878

Author: elibus

antlir/antlir2/features/apt/tests/BUCK

@@ -33,6 +33,8 @@ antlir2_configured_alias(
     name = "test-bash-installed-ubuntu-noble",
     actual = ":test-bash-installed",
     default_os = "ubuntu-noble",
+    # Noble does not have aarch64 packages
+    target_compatible_with = ["ovr_config//cpu:x86_64"],
 )
 
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