AppConfig: Remove usage of ServiceProvider in ExecuteAsync.

[conniey]

What does this PR do?

Step towards improving testability by reducing the usage of CommandContext.ServiceProvider. Making dependencies explicit.

GitHub issue number?

#158

Pre-merge Checklist

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[Copilot]

Pull request overview

This PR improves testability for the AppConfig tool by removing command-time service resolution (CommandContext.ServiceProvider / context.GetService<T>()) and making IAppConfigService an explicit constructor dependency for the affected commands.

Changes:

• Updated AppConfig commands to inject IAppConfigService via primary constructors and use the injected instance in ExecuteAsync.
• Updated AppConfig unit tests to construct commands with the injected IAppConfigService substitute and removed the need to register it in the test ServiceProvider.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.AppConfig/src/Commands/KeyValue/Lock/KeyValueLockSetCommand.cs	Inject IAppConfigService and stop resolving it from CommandContext during execution.
tools/Azure.Mcp.Tools.AppConfig/src/Commands/KeyValue/KeyValueSetCommand.cs	Inject IAppConfigService and use it directly in ExecuteAsync.
tools/Azure.Mcp.Tools.AppConfig/src/Commands/KeyValue/KeyValueGetCommand.cs	Inject IAppConfigService and stop calling context.GetService<IAppConfigService>().
tools/Azure.Mcp.Tools.AppConfig/src/Commands/KeyValue/KeyValueDeleteCommand.cs	Inject IAppConfigService and use it directly in ExecuteAsync.
tools/Azure.Mcp.Tools.AppConfig/src/Commands/Account/AccountListCommand.cs	Inject IAppConfigService and use it directly in ExecuteAsync.
tools/Azure.Mcp.Tools.AppConfig/tests/Azure.Mcp.Tools.AppConfig.UnitTests/KeyValue/Lock/KeyValueLockSetCommandTests.cs	Update test to pass IAppConfigService into command constructor; no longer register it in DI.
tools/Azure.Mcp.Tools.AppConfig/tests/Azure.Mcp.Tools.AppConfig.UnitTests/KeyValue/KeyValueSetCommandTests.cs	Same as above for KeyValueSetCommand.
tools/Azure.Mcp.Tools.AppConfig/tests/Azure.Mcp.Tools.AppConfig.UnitTests/KeyValue/KeyValueGetCommandTests.cs	Same as above for KeyValueGetCommand.
tools/Azure.Mcp.Tools.AppConfig/tests/Azure.Mcp.Tools.AppConfig.UnitTests/KeyValue/KeyValueDeleteCommandTests.cs	Same as above for KeyValueDeleteCommand.
tools/Azure.Mcp.Tools.AppConfig/tests/Azure.Mcp.Tools.AppConfig.UnitTests/Account/AccountListCommandTests.cs	Same as above for AccountListCommand.