Add App Service web app application setting tools

[alzimmermsft]

What does this PR do?

Add App Service web app application setting tools for listing application settings and modifying them (add, set, and delete).

GitHub issue number?

[Link to the GitHub issue this PR addresses]

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Updated servers/Azure.Mcp.Server/CHANGELOG.md and/or servers/Fabric.Mcp.Server/CHANGELOG.md for product changes (features, bug fixes, UI/UX, updated dependencies)
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Validate README.md changes using script at eng/scripts/Process-PackageReadMe.ps1. See Package README
  • Updated command list in /servers/Azure.Mcp.Server/docs/azmcp-commands.md and/or /docs/fabric-commands.md
  • Run .\eng\scripts\Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For tools with new names, including new tools or renamed tools, update consolidated-tools.json
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated test prompts in /servers/Azure.Mcp.Server/docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

[Copilot]

Pull request overview

This pull request adds two new tools for managing Azure App Service web app application settings: one for listing/getting settings and another for updating them (add, set, delete operations).

Changes:

• Added AppSettingsGetCommand to retrieve application settings for a web app
• Added AppSettingsUpdateCommand to add, set, or delete application settings
• Introduced comprehensive unit and live tests for both commands
• Updated documentation including command reference and test prompts
• Registered new commands in consolidated tools configuration

Reviewed changes

Copilot reviewed 25 out of 26 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.AppService/src/Commands/Webapp/Settings/AppSettingsGetCommand.cs	New command for retrieving app settings
tools/Azure.Mcp.Tools.AppService/src/Commands/Webapp/Settings/AppSettingsUpdateCommand.cs	New command for modifying app settings with validation
tools/Azure.Mcp.Tools.AppService/src/Services/AppServiceService.cs	Service implementation for get and update operations
tools/Azure.Mcp.Tools.AppService/src/Services/IAppServiceService.cs	Interface additions for app settings operations
tools/Azure.Mcp.Tools.AppService/src/Options/Settings/AppSettingsUpdateCommandOptions.cs	Options class for update command parameters
tools/Azure.Mcp.Tools.AppService/src/Options/AppServiceOptionDefinitions.cs	New option definitions for setting name, value, and update type
tools/Azure.Mcp.Tools.AppService/src/Commands/BaseAppServiceCommand.cs	Updated to support optional vs required resource groups
tools/Azure.Mcp.Tools.AppService/src/Commands/AppServiceJsonContext.cs	Added JSON serialization context for new result types
tools/Azure.Mcp.Tools.AppService/src/AppServiceSetup.cs	Registered new commands with DI and command groups
tools/Azure.Mcp.Tools.AppService/tests/Azure.Mcp.Tools.AppService.UnitTests/Commands/Webapp/Settings/*.cs	Comprehensive unit tests for both commands
tools/Azure.Mcp.Tools.AppService/tests/Azure.Mcp.Tools.AppService.LiveTests/Webapp/Settings/*.cs	Live integration tests for both commands
tools/Azure.Mcp.Tools.AppService/tests/Azure.Mcp.Tools.AppService.LiveTests/BaseAppServiceCommandLiveTests.cs	Base class to consolidate common test sanitizers
tools/Azure.Mcp.Tools.AppService/tests/test-resources.bicep	Added app settings to test web app resource
servers/Azure.Mcp.Server/docs/azmcp-commands.md	Added command documentation and examples
servers/Azure.Mcp.Server/docs/e2eTestPrompts.md	Added test prompts for new commands
core/Microsoft.Mcp.Core/src/Areas/Server/Resources/consolidated-tools.json	Registered new tools in consolidated tool list