Remove non-visual schema compare feature

[Copilot]

• Investigate the codebase to understand the non-visual compare feature
• Remove compare command from src/DacFXTool/Program.cs
• Remove Compare() method from src/DacFXToolLib/DacPackageComparer.cs
• Delete src/Vsix/Commands/CompareCommand.cs
• Delete src/Vsix/Handlers/CompareHandler.cs
• Remove GetCompareAsync from src/Vsix/Handlers/ProcessLauncher.cs
• Remove cmdidCompare button from src/Vsix/VSCommandTable.vsct
• Remove cmdidCompare from src/Vsix/VSCommandTable.cs
• Remove deleted files from src/Vsix/Vsix.csproj compile items
• Build and verify changes

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove non-visual compare feature</issue_title>
<issue_description>Including in the Vsix project and the command line tool</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove non-visual compare feature #170

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[Copilot]

Pull request overview

This PR removes the non-visual schema compare feature (plain SQL diff script generation) across the VSIX extension, CLI tool, and shared library, keeping the visual schema compare functionality intact.

Changes:

• Removes the VSIX command/button and supporting handler/launcher entry point for non-visual compare.
• Removes the CLI compare command handler block.
• Removes the library DacPackageComparer.Compare() method and related unused imports.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Vsix/VSCommandTable.vsct	Removes the “Schema compare script...” command/button and its ID symbol.
src/Vsix/VSCommandTable.cs	Removes the cmdidCompare constant from generated package IDs.
src/Vsix/Handlers/ProcessLauncher.cs	Removes the GetCompareAsync() launcher method that invoked the CLI compare command.
src/DacFXToolLib/DacPackageComparer.cs	Removes the non-visual Compare() API and cleans up now-unused imports.
src/DacFXTool/Program.cs	Removes the CLI compare command handler block.

Comments suppressed due to low confidence (1)

src/DacFXTool/Program.cs:209

• With the compare command removed, invoking dacfxtool compare ... will now fall through the command dispatch without printing an error and still return exit code 0. It would be better to either explicitly detect compare and return a non-zero exit code with a clear message (e.g., command removed / use visualcompare), or add a final default branch that treats unknown commands as an error.

                    // visualcompare "<DACPAC_PATH>" "connectionString" <database_is_source>
                    if (args.Length == 4
                        && args[0] == "visualcompare"
                        && bool.TryParse(args[3], out bool visualDbIsSource))
                    {