antctl.exe supportbundle command doesn't support path flag on Windows

[XinShuYang]

Describe the bug
In Windows, running antctl.exe supportbundle -d reports an error. The antctl tool is expected to support the -d (path) flag according to https://github.com/antrea-io/antrea/blob/main/docs/antctl.md#collecting-support-information, but it is not working on Windows.

To Reproduce

1. Run the following command in Windows:

.\antctl.exe supportbundle -d C:\var\log\antrea\

2. The following error is observed:

Error: unknown shorthand flag: 'd' in -d

Expected
The command should allow the user to specify a path to save the support bundle file on Windows using the -d flag.

Actual behavior
An error is thrown when trying to use the -d flag in Windows:
Error: unknown shorthand flag: 'd' in -d

Versions:
Antrea V2.1

[XinShuYang]

Hi @luolanzone @rajnkamr, recently @wenyingd and I found two bugs with antctl on Windows(#6688 #6687). While they are not urgent, we believe they should be addressed eventually. Please feel free to assign them to anyone interested or needing familiarity with the antrea Windows/antctl modules. Thanks!