fix: restore powershell_wmf reboot delay

[damacus]

Summary:

• add an explicit reboot_delay_mins property to powershell_wmf for delayed reboot requests
• preserve the legacy reboot_timeout_seconds fallback when no explicit delay is set
• document the new property and cover both paths in ChefSpec

Testing:

• /opt/chef-workstation/embedded/bin/rspec --format documentation
• cookstyle resources/powershell_wmf.rb spec/unit/resources/powershell_wmf_spec.rb

[github-actions]

Slowest examples

Top 10 slowest examples (1.1 seconds, 44.16% of total time)

Example	Description	Time in seconds
spec/unit/resources/powershell_dsc_spec.rb:17	powershell_dsc is expected to install powershell_wmf "4.0"	0.14481
spec/unit/resources/powershell_lcm_spec.rb:27	powershell_lcm with action :enable is expected to create directory "Creating temporary directory to store LCM MOF files"	0.11872
spec/unit/resources/powershell_wmf_spec.rb:65	powershell_wmf when installing PowerShell 5.1 on Windows Server 2008 R2 is expected to include recipe "ms_dotnet::ms_dotnet4"	0.11377
spec/unit/resources/powershell_wmf_spec.rb:78	powershell_wmf when installing PowerShell 5.1 on Windows Server 2008 R2 is expected to equal true	0.11064
spec/unit/resources/powershell_lcm_spec.rb:26	powershell_lcm with action :enable is expected to create powershell_dsc "default"	0.10749
spec/unit/resources/powershell_wmf_spec.rb:20	powershell_wmf when installing PowerShell 2.0 on Windows Server 2012 is expected to install windows_feature "MicrosoftWindowsPowerShellV2"	0.10421
spec/unit/resources/powershell_wmf_spec.rb:66	powershell_wmf when installing PowerShell 5.1 on Windows Server 2008 R2 is expected to create remote_file "C:/Users/RUNNER~1/AppData/Local/Temp/d20260421-7708-rixk53\wmf51.zip"	0.10271
spec/unit/resources/powershell_wmf_spec.rb:72	powershell_wmf when installing PowerShell 5.1 on Windows Server 2008 R2 is expected to extract archive_file "C:/Users/RUNNER~1/AppData/Local/Temp/d20260421-7708-bt3ymd\wmf51.zip"	0.1014
spec/unit/resources/powershell_wmf_spec.rb:114	powershell_wmf when using the legacy reboot timeout override is expected to eq 2	0.1006
spec/unit/resources/powershell_wmf_spec.rb:98	powershell_wmf when requesting a delayed reboot with an explicit delay is expected to eq 5	0.09974