Add support for git SSH registry URL

### Description of the feature request:

Be able to use a git SSH registry URL
Example in .bazelrc:
```
common --registry=git@github.com:bazelbuild/bazel-central-registry.git
```

### Which category does this issue belong to?

_No response_

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

Add a private git repository protected by ssh key as Bazel register

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

Rocky Linux 9.4 (Blue Onyx)

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

release 7.1.1

### 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` ?

_No response_

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

_No response_

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

Using a git SSH registry URL gives me the following error message
```
Invalid registry URL: Unrecognized registry URL protocol
```

Start with the .bazelrc registry example and trace the validation that produces “Unrecognized registry URL protocol.” Check how the Bazel registry code handles the requested git@github.com: SSH form, then verify that a private SSH-protected registry is accepted without the invalid-protocol error on Rocky Linux 9.4.

Written by the indexing model from the issue text.