Replace commented-out assertions in DSC_SChannelSettings unit tests with skipped tests

Description

The unit test file tests/Unit/DSC_SChannelSettings.Tests.ps1 contains multiple commented-out assertions for WinHttpDefaultSecureProtocols validation at lines 207-210, 368-371, and 529-532. These assertions are commented out due to 32-bit/64-bit system mismatches that cause test failures.

Current State

Commented-out assertions violate the coding guideline: "No commented-out code". The assertions are currently hidden and not tracked by test tooling.

Expected Outcome

Convert the commented-out assertions into properly skipped tests using Pester's -Skip parameter or Set-ItResult -Skipped, with clear skip reasons referencing the 32-bit/64-bit compatibility issue.

Context

• Reported by: @dan-hughes
• Pull Request: https://github.com/dsccommunity/SChannelDsc/pull/66
• Review Comment: https://github.com/dsccommunity/SChannelDsc/pull/66#discussion_r2737360154

Affected Locations

• tests/Unit/DSC_SChannelSettings.Tests.ps1 lines 207-210
• tests/Unit/DSC_SChannelSettings.Tests.ps1 lines 368-371
• tests/Unit/DSC_SChannelSettings.Tests.ps1 lines 529-532