Replace throw with New-InvalidOperationException in DSC_SChannelSettings

Description

Replace the raw throw statement in DSC_SChannelSettings.psm1 (lines 599-600) with New-InvalidOperationException using a localized message.

Changes Needed

1. Add a new localized string key to source/DSCResources/DSC_SChannelSettings/en-US/DSC_SChannelSettings.strings.psd1:

   HotfixNotInstalled = 'Hotfix KB3140245 is not installed. Setting these registry keys will not do anything. Please install the hotfix first.'
   

2. Replace the throw statement in source/DSCResources/DSC_SChannelSettings/DSC_SChannelSettings.psm1 (lines 599-600):

   # Current:
   throw ('Hotfix KB3140245 is not installed. Setting these registry keys will not do anything. ' + `
           'Please install the hotfix first!')
   
   # Should be:
   New-InvalidOperationException -Message $script:localizedData.HotfixNotInstalled
   

Context

MOF-based DSC resources must use New-InvalidOperationException instead of raw throw statements for proper error handling, and all user-facing strings must be localized.

References

• PR #66: https://github.com/dsccommunity/SChannelDsc/pull/66
• Comment: https://github.com/dsccommunity/SChannelDsc/pull/66#discussion_r2732718715
• Requested by: @johlju

Read source/DSCResources/DSC_SChannelSettings/DSC_SChannelSettings.psm1 around lines 599-600 and the localized strings in source/DSCResources/DSC_SChannelSettings/en-US/DSC_SChannelSettings.strings.psd1. Add the HotfixNotInstalled message to the strings file and replace the raw throw with New-InvalidOperationException using the localized value. Done means the error uses the localized message and the resource no longer contains this raw throw.