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What steps will reproduce the problem?

When running 'gcloud workstations ssh' on windows, putty is opened in any cases as the implementation in ssh.py uses putty if windows is detected.

```
    if platforms.OperatingSystem.IsWindows():
      suite = Suite.PUTTY
      bin_path = _SdkHelperBin()
    else:
      suite = Suite.OPENSSH
      bin_path = None
    return Environment(suite, bin_path)
```

What is the expected output? What do you see instead?

As many windows developers have git bash or similar toolset installed, openssh is also available in Windows.
There should be a config option to also use openssh in windows, to also use oopenssh.
This would allow to integrate gcloud workstations ssh into windowsx terminal.

Please provide any additional information below.



Installation information:

Google Cloud SDK [506.0.0]

Platform: [Windows, x86_64] uname_result(system='Windows', node='FENNB04995', release='10', version='10.0.22631', machine='AMD64')
Locale: ('German_Switzerland', '1252')
Python Version: [3.11.9 (tags/v3.11.9:de54cf5, Apr  2 2024, 10:12:12) [MSC v.1938 64 bit (AMD64)]]
Python Location: [${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython\python.exe]
OpenSSL: [OpenSSL 3.0.13 30 Jan 2024]
Requests Version: [2.25.1]
urllib3 Version: [1.26.9]
Default CA certs file: [${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\lib\third_party\certifi\cacert.pem]
Site Packages: [Disabled]

Installation Root: [${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk]
Installed Components:
  bq: [2.1.11]
  core: [2025.01.10]
  gcloud-crc32c: [1.0.0]
  gsutil: [5.33]
System PATH: [${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\sdk;C:\Program Files\Python310\Scripts\;C:\Program Files\Python310\;C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\wbin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files (x86)\instantclient_12_1;C:\Program Files\dotnet\;C:\Program Files (x86)\Microsoft SQL Server\150\DTS\Binn\;C:\Program Files\Azure Data Studio\bin;C:\Program Files\PuTTY\;C:\Program Files (x86)\Enterprise Vault\EVClient\x64\;${HOME}\AppData\Local\Microsoft\WindowsApps;C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\wbin\;C:\workspace\cygwin64\bin;${HOME}\AppData\Local\Microsoft\WindowsApps;C:\workspace\Jetbrains-Scripts;${HOME}\bin;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin]
Python PATH: [${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\lib\third_party;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\lib;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\lib;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython\python311.zip;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython\DLLs;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython\Lib;${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython]
Cloud SDK on PATH: [False]
Kubectl on PATH: [False]

Installation Properties: [${HOME}\AppData\Local\Google\Cloud SDK\google-cloud-sdk\properties]
User Config Directory: [${CLOUDSDK_CONFIG}]
Active Configuration Name: [default]
Active Configuration Path: [${CLOUDSDK_CONFIG}\configurations\config_default]

Account: [m..r@b..m]
Project: [p..s]
Universe Domain: [googleapis.com]

Current Properties:
  [accessibility]
    screen_reader: [False] (property file)
  [auth]
    disable_ssl_validation: [False] (property file)
  [compute]
    zone: [europe-west6-a] (property file)
    region: [europe-west6] (property file)
  [core]
    account: [m..r@b..m] (property file)
    disable_usage_reporting: [false] (property file)
    custom_ca_certs_file: [C:/Program Files/Python310/lib/site-packages/certifi/cacert.pem] (property file)
    project: [p..s] (property file)

Logs Directory: [${CLOUDSDK_CONFIG}\logs]
Last Log File: [${CLOUDSDK_CONFIG}\logs\2025.01.27\07.41.05.379475.log]

git: [git version 2.39.0]
ssh: [OpenSSH_for_Windows_9.5p1, LibreSSL 3.8.2
]