Respect binary args in --run_under

### Description of the feature request:

[--run_under](https://bazel.build/docs/user-manual#test-run-under) can be set to the label of a binary build target. However, if that binary target has [args](https://bazel.build/reference/be/common-definitions#binary.args), these `args` are ignored rather than passed to the binary. This is unexpected and inconvenient, reducing the expressiveness of `--run_under`.

### Which category does this issue belong to?

_No response_

### What underlying problem are you trying to solve with this feature?

I'd like to use a [native_binary](https://github.com/bazelbuild/bazel-skylib/blob/main/docs/native_binary_doc.md) wrapper to encapsulate the `args` that a test runner binary should be invoked with.

### Which operating system are you running Bazel on?

Linux

### What is the output of `bazel info release`?

8.1.0

### If `bazel info release` returns `development version` or `(@non-git)`, tell us how you built Bazel.

_No response_

### What's the output of `git remote get-url origin; git rev-parse HEAD` ?

```text

```

### Have you found anything relevant by searching the web?

_No response_

### Any other information, logs, or outputs that you want to share?

_No response_

Start with the --run_under user-manual entry and the linked binary.args and native_binary documentation, then trace how a labeled binary target is invoked for test execution. Done means args declared on the --run_under binary target are passed to that binary, with coverage for the reported behavior.

Written by the indexing model from the issue text.