[Bug]: `az network bastion ssh` does not allow configuration of ssh-client-folder

### Describe the bug

If OpenSSH is not installed at the default location, then commands to create an ssh tunnel via `az network bastion ssh` do not work, since ssh commands are unvailable. The returned error states that one can specify the `ssh-client-folder`, but this is incorrect.

`az ssh` commands allows for the specification of the `--ssh-client-folder`, but this is not recognised as a vaild parameter to `az network bastion ssh`.

More specifically, the function `_get_ssh_path` could be modified (see [this code snippet](https://github.com/Azure/azure-cli-extensions/blob/f3ce4273072a174ee1a7a515841d1ea085b1a59d/src/bastion/azext_bastion/custom.py#L83)) to allow the specification of another folder for `ssh.exe`, instead of hardcoding the path to ssh as `SYSTEMROOT/System32/OpenSSH/ssh.exe`.

Linux and Darwin implementations use `which` in order to find the location of `ssh` using shutil, which could be extended to Windows if `shutil.which(ssh_command)` returns a valid path.

### Related command

`az ssh`

### Errors

Could not find ssh-keygen.exe on path C:\WINDOWS\System32\openSSH\ssh-keygen.exe.
Make sure OpenSSH is installed correctly: https://docs.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse . Or use --ssh-client-folder to provide folder path with ssh executables.

### Issue script & Debug output

`az network bastion ssh --name **** --resource-group **** --auth-type AAD --target-resource-id /subscriptions/****/resourceGroups/****/providers/Microsoft.Compute/virtualMachines/**vm_name** --debug`

DEBUG: cli.knack.cli: Command arguments: ['network', 'bastion', 'ssh', '--name', '****', '--resource-group', '****', '--auth-type', 'AAD', '--target-resource-id', '/subscriptions/****/resourceGroups/****/providers/Microsoft.Compute/virtualMachines/**vm_name**', '--debug']
DEBUG: cli.knack.cli: __init__ debug log:
Cannot enable color.
DEBUG: cli.knack.cli: Event: Cli.PreExecute []
DEBUG: cli.knack.cli: Event: CommandParser.OnGlobalArgumentsCreate [, , ]
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableCreate []
DEBUG: cli.azure.cli.core: Modules found from index for 'network': ['azure.cli.command_modules.network', 'azure.cli.command_modules.privatedns', 'azext_bastion']
DEBUG: cli.azure.cli.core: Loading command modules:
DEBUG: cli.azure.cli.core: Name Load Time Groups Commands
DEBUG: cli.azure.cli.core: network 1.225 115 454
DEBUG: cli.azure.cli.core: privatedns 0.075 14 60
DEBUG: cli.azure.cli.core: Total (2) 1.300 129 514
DEBUG: cli.azure.cli.core: These extensions are not installed and will be skipped: ['azext_ai_examples', 'azext_next']
DEBUG: cli.azure.cli.core: Loading extensions:
DEBUG: cli.azure.cli.core: Name Load Time Groups Commands Directory
DEBUG: cli.azure.cli.core: bastion 0.040 2 9 C:\Users\**USER**\.azure\cliextensions\bastion
DEBUG: cli.azure.cli.core: Total (1) 0.040 2 9
DEBUG: cli.azure.cli.core: Loaded 129 groups, 523 commands.
DEBUG: cli.azure.cli.core: Found a match in the command table.
DEBUG: cli.azure.cli.core: Raw command : network bastion ssh
DEBUG: cli.azure.cli.core: Command table: network bastion ssh
DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableTruncate []
DEBUG: cli.azure.cli.core.azlogging: metadata file logging enabled - writing logs to 'C:\Users\**USER**\.azure\commands\2024-06-25.14-01-58.network_bastion_ssh.27492.log'.
INFO: az_command_data_logger: command args: network bastion ssh --name {} --resource-group {} --auth-type {} --target-resource-id {} --debug
*REDACTED CLI AUTH INFO*
DEBUG: cli.azure.cli.core.sdk.policies: Request URL: 'https://management.azure.com/subscriptions/**SUBSCRIPTION**/resourceGroups/****/providers/Microsoft.Network/bastionHosts/****?api-version=2022-01-01'
DEBUG: cli.azure.cli.core.sdk.policies: Request method: 'GET'
DEBUG: cli.azure.cli.core.sdk.policies: Request headers:
*REDACTED REQUEST HEADERS*
DEBUG: cli.azure.cli.core.sdk.policies: Request body:
DEBUG: cli.azure.cli.core.sdk.policies: This request has no body
DEBUG: urllib3.connectionpool: Starting new HTTPS connection (1): management.azure.com:443
DEBUG: urllib3.connectionpool: https://management.azure.com:443 "GET /subscriptions/**SUBSCRIPTION**/resourceGroups/****/providers/Microsoft.Network/bastionHosts/****?api-version=2022-01-01 HTTP/1.1" 200 2156
DEBUG: cli.azure.cli.core.sdk.policies: Response status: 200
*REDACTED INFO ON RESPONSE HEADERS*
DEBUG: cli.azure.cli.core.sdk.policies: Response content:
DEBUG: cli.azure.cli.core.sdk.policies: {
*REDACTED*
}
INFO: cli.azext_bastion.tunnel: Creating a socket on port: 0
INFO: cli.azext_bastion.tunnel: Setting socket options
INFO: cli.azext_bastion.tunnel: Binding to socket on local address and port
INFO: cli.azext_bastion.tunnel: Auto-selecting port: 49239
INFO: cli.azext_bastion.tunnel: Finished initialization
DEBUG: cli.azext_ssh.ssh_utils: Platform architecture: 64bit
DEBUG: cli.azext_ssh.ssh_utils: OS architecture: 64bit
DEBUG: cli.azext_ssh.ssh_utils: System Root: C:\WINDOWS
DEBUG: cli.azext_ssh.ssh_utils: Attempting to run ssh-keygen from path C:\WINDOWS\System32\openSSH\ssh-keygen.exe
DEBUG: cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 664, in execute
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 731, in _run_jobs_serially
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 701, in _run_job
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 334, in __call__
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/command_operation.py", line 121, in handler
File "C:\Users\**USER**\.azure\cliextensions\bastion\azext_bastion\custom.py", line 184, in ssh_bastion_host
azssh.ssh_cert(cmd, cert_path=os.path.join(cert_folder, "REDACTED"))
File "C:\Users\**USER**\.azure\cliextensions\ssh\azext_ssh\custom.py", line 127, in ssh_cert
public_key_file, _, _ = _check_or_create_public_private_files(public_key_file, None, keys_folder, ssh_client_folder)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\**USER**\.azure\cliextensions\ssh\azext_ssh\custom.py", line 319, in _check_or_create_public_private_files
ssh_utils.create_ssh_keyfile(private_key_file, ssh_client_folder)
File "C:\Users\**USER**\.azure\cliextensions\ssh\azext_ssh\ssh_utils.py", line 164, in create_ssh_keyfile
sshkeygen_path = get_ssh_client_path("ssh-keygen", ssh_client_folder)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\**USER**\.azure\cliextensions\ssh\azext_ssh\ssh_utils.py", line 324, in get_ssh_client_path
raise azclierror.UnclassifiedUserFault(
azure.cli.core.azclierror.UnclassifiedUserFault: Could not find ssh-keygen.exe on path C:\WINDOWS\System32\openSSH\ssh-keygen.exe.

ERROR: cli.azure.cli.core.azclierror: Could not find ssh-keygen.exe on path C:\WINDOWS\System32\openSSH\ssh-keygen.exe.
ERROR: az_command_data_logger: Could not find ssh-keygen.exe on path C:\WINDOWS\System32\openSSH\ssh-keygen.exe.
Make sure OpenSSH is installed correctly: https://docs.microsoft.com/en-us/windows-server/administration/openssh/openssh_install_firstuse . Or use --ssh-client-folder to provide folder path with ssh executables.
DEBUG: cli.knack.cli: Event: Cli.PostExecute []
INFO: az_command_data_logger: exit code: 1
INFO: cli.__main__: Command ran in 4.515 seconds (init: 0.839, invoke: 3.676)
INFO: telemetry.main: Begin splitting cli events and extra events, total events: 1
INFO: telemetry.client: Accumulated 0 events. Flush the clients.
INFO: telemetry.main: Finish splitting cli events and extra events, cli events: 1
INFO: telemetry.save: Save telemetry record of length 3878 in cache
INFO: telemetry.main: Begin creating telemetry upload process.
INFO: telemetry.process: Creating upload process: "C:\Program Files\Microsoft SDKs\Azure\CLI2\python.exe C:\Program Files\Microsoft SDKs\Azure\CLI2\Lib\site-packages\azure\cli\telemetry\__init__.pyc C:\Users\**USER**\.azure"
INFO: telemetry.process: Return from creating process
INFO: telemetry.main: Finish creating telemetry upload process.

### Expected behavior

Expected behaviour is that one can specify the parameter for `ssh-client-folder`, as used in the `az ssh` extension.

### Environment Summary

azure-cli 2.59.0 *

core 2.59.0 *
telemetry 1.1.0

Extensions:
amg 1.3.2
bastion 1.0.1
ssh 2.0.3

Dependencies:
msal 1.27.0
azure-mgmt-resource 23.1.0b2

Python location `C:\Program Files\Microsoft SDKs\Azure\CLI2\python.exe`
Extensions directory `C:\Users\USER\.azure\cliextensions`

Python (Windows) 3.11.8 (tags/v3.11.8:db85d51, Feb 6 2024, 22:03:32) [MSC v.1937 64 bit (AMD64)]

### Additional context

_No response_