Ability to configure domain name from wsl.conf

### Windows Version

Microsoft Windows [version 10.0.22621.3593]

### WSL Version

1.2.5.0

### Are you using WSL 1 or WSL 2?

- [X] WSL 2
- [ ] WSL 1

### Kernel Version

5.15.90.1

### Distro Version

Ubuntu 22.04

### Other Software

_No response_

### Repro Steps

If `generateResolvConf` is false, I can configure the company's domain manually in `/etc/resolv.conf`.
However, with such a configuration, it is more difficult to retrieve the WSL gateway IP address, ex
`NEW_IP=$(grep -m 1 nameserver /etc/resolv.conf | awk '{print $2}')`.
As a workaround, one can use:
`netstat -rn | grep "^0.0.0.0" | awk '{print $2}'`

### Expected Behavior

1. I would like to enable my company's domain in WSL to be able to ping internal servers without having to specify the domain name every time.
2. I would like to access windows host easily from WSL (using a DNS name), ex windows-host.

### Actual Behavior

When `generateResolvConf` is true, WSL ignores my company's domain, thus I cannot ping servers of my network without specifying the domain (ex: `ping mygitserver.MY.COMPANY`).

### Diagnostic Logs

_No response_

Start by reproducing the WSL 2 behavior with generateResolvConf enabled and compare /etc/resolv.conf with the manual configuration described in the issue. Trace how wsl.conf settings and resolv.conf generation are handled, then verify that a configured search domain and a DNS name for the Windows host work without manual gateway discovery.

Written by the indexing model from the issue text.