`dotnet tool install` `--source` option does not work

### Environment
dotnet sdk version: 10.0.100-rtm.25507.103

### Description
When running `dotnet tool install` with a `--source` argument, the command still installs the tool from a feed defined in a nearby `nuget.config` file instead of using the specified source.
It appears that the local configuration file takes precedence over the `--source` parameter, making the `--source` option ineffective.

### To Reproduce

1. Create the following directory structure:

```
root/
├── test/
│ ├── nuget.config
```
2. Add the following `nuget.config` file under the `test` folder:

```xml







```
3. In the `test` folder, run:

```bash
dotnet tool install Cake.Tool --source https://api.nuget.org/v3/index.json
```
4. Observe that the tool is still installed from the local feed instead of NuGet.org.

### Expected behavior

The `--source` option should override any sources defined in a local `nuget.config` file and use only the explicitly specified source.

### Actual behavior

Even when `--source` is specified, `dotnet tool install` continues to use the source defined in the nearest `nuget.config` file.