Reduce dependency preflight noise and fix WiX v6 detection

[johnml1135]

Summary

• make dependency preflight output compact by default (max 3 lines when checks pass)
• remove legacy NuGet CLI warning/check from dependency preflight
• fix WiX v6 detection to recognize SDK-style Project Sdk="WixToolset.Sdk/..."
• stop emitting result-object table by default (add -PassThru for scripted callers)

Validation

• ./Build/Agent/Verify-FwDependencies.ps1
• ./Build/Agent/Verify-FwDependencies.ps1 -IncludeOptional
• ./Build/Agent/Verify-FwDependencies.ps1 -IncludeOptional -Detailed

Notes

• Detailed output remains available via -Detailed.
• Compact output now reports accurate required/optional counts.

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This change is 

[Copilot]

Pull request overview

Reduces default verbosity of dependency preflight output, removes the legacy NuGet CLI check, and improves WiX v6 detection for SDK-style installer projects.

Changes:

• Adds -Detailed and -PassThru to control verbosity and scripted output.
• Removes the legacy NuGet CLI dependency check from preflight.
• Updates WiX v6 detection to recognize Project Sdk="WixToolset.Sdk/..." (and PackageReference) patterns.

[Copilot]

When casting file content to [xml], using Get-Content without -Raw returns an array of lines, which can be implicitly re-joined and is more error-prone than reading the file as a single string. Prefer Get-Content -Raw -LiteralPath $wixProj before the [xml] cast to make XML parsing behavior deterministic.

Suggested change

	[xml]$wixProjXml = Get-Content -LiteralPath $wixProj
	[xml]$wixProjXml = Get-Content -Raw -LiteralPath $wixProj

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   6m 14s ⏱️ +34s
4 407 tests ±0  4 320 ✅ ±0  87 💤 ±0  0 ❌ ±0 
4 416 runs  ±0  4 329 ✅ ±0  87 💤 ±0  0 ❌ ±0 

Results for commit 4d990e9. ± Comparison against base commit 0d6dace.

♻️ This comment has been updated with latest results.

[papeh]

Documentation for the new params would be good; otherwise, looks good.