Rollup merge of #99100 - Smittyvb:test-cli-binary-name, r=thomcc

Rollup merge of #99100 - Smittyvb:test-cli-binary-name, r=thomcc

Fix binary name in help message for test binaries

Currently the help output for a test binary uses the first argument instead of the binary name in the help output:

```
$ cargo test -- --help
...
Usage: --help [OPTIONS] [FILTERS...]
...
```

This fixes it to use the name of the binary (or `...` if there is no binary name passed on argv):

```
$ cargo test -- --help
...
Usage: /tmp/x/target/debug/deps/x-80c11a15ad4e1bf3 [OPTIONS] [FILTERS...]
...
```