Fix update-cgmanifest.ps1 script to generate deterministic output

[Copilot]

The update-cgmanifest.ps1 script was regenerating the entire cgmanifest.json file each time it ran, causing unnecessary changes in source control even when there were no actual changes to package versions.

Issues Fixed

1. Non-deterministic ordering: Package registrations were added in processing order rather than sorted order, causing different ordering between runs
2. Inconsistent JSON property ordering: PowerShell hashtables don't guarantee property order, leading to inconsistent JSON structure
3. Unnecessary file writes: The script would rewrite the file even when content was identical

Changes Made

• Sort registrations alphabetically: Added Sort-Object { $_.component.nuget.name } to ensure consistent package ordering
• Use ordered hashtables: Modified New-PackageEntry function to use [ordered] hashtables for consistent JSON property ordering
• Content comparison optimization: Added logic to compare existing content with new content and only write when changes are detected
• Normalize line endings: Added proper line ending normalization for cross-platform compatibility

Before/After Comparison

Before: Running the script twice would show git changes even with identical package versions:

 "component": {
+  "type": "nuget",
   "nuget": {
-    "version": "11.1.1",
-    "name": "CommunityToolkit.Maui"
+    "name": "CommunityToolkit.Maui", 
+    "version": "11.1.1"
   },
-  "type": "nuget"
 }

After: Running the script multiple times produces identical output with no spurious git changes, and shows "No changes detected - cgmanifest.json is already up to date" when appropriate.

Testing

✅ Script produces identical output on successive runs
✅ Packages are sorted alphabetically by name
✅ JSON properties have consistent ordering (type → nuget → name → version)
✅ Content comparison optimization works correctly
✅ Cake build integration (dotnet cake --target=GenerateCgManifest) still works
✅ New file creation functionality preserved
✅ All existing functionality maintained

Fixes #30054.

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[Copilot]

Pull Request Overview

This PR fixes the update-cgmanifest.ps1 script to generate deterministic output by enforcing a consistent JSON structure and package registration order.

• Sorting of package registrations alphabetically
• Using [ordered] hashtables to guarantee property ordering
• Optimizing file writes by comparing content before saving

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Templates/src/cgmanifest.json	Updated JSON structure entries to reflect a consistent order of properties and package registrations.
eng/scripts/update-cgmanifest.ps1	Introduced ordered hashtables, added sorting for registrations, and implemented content comparison logic.

[rmarinho]

/azp run MAUI-public

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