Refactor communication with AWS for KeyValueStore updates

[cotti]

Given AWSSDK's Cloudfront KeyValueStore APIs still depend on AWSSDK.Extensions.CrtIntegration, which isn't AOT-compatible, we need to fallback to an alternative method of communicating with AWS to update the Cloudfront KVS.

This PR introduces communication via CLI and extends ExternalCommandExecutor to allow customizing the amount of retries.

More information:

• There is an issue on aws-sdk-net to discuss a new library to substitute AWSSDK.Extensions.CrtIntegration, but no implementation yet.

[Copilot]

Pull Request Overview

This PR replaces direct AWS SDK calls for CloudFront KeyValueStore with CLI-based interactions to ensure AOT compatibility by removing dependencies on AWSSDK.Extensions.CrtIntegration.

• Removed AWSSDK.CloudFront and AWSSDK.CloudFrontKeyValueStore package references.
• Introduced JSON model types and a proxy (AwsCloudFrontKeyValueStoreProxy) that uses the AWS CLI for KVS operations.
• Updated the deploy command to use the new proxy and enhanced retry logic in ExternalCommandExecutor.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/tooling/docs-assembler/docs-assembler.csproj	Removed CloudFront SDK package references.
src/tooling/docs-assembler/Deploying/Serialization/AwsCloudFrontKeyValueStoreModels.cs	Added serialization records and source-generated JSON context.
src/tooling/docs-assembler/Deploying/AwsCloudFrontKeyValueStoreProxy.cs	New proxy for KVS operations using AWS CLI and batched updates.
src/tooling/docs-assembler/Cli/DeployCommands.cs	Swapped SDK calls for AwsCloudFrontKeyValueStoreProxy usage.
src/tooling/Elastic.Documentation.Tooling/ExternalCommands/ExternalCommandExecutor.cs	Extended Capture method with retry attempts and exposed collector.
Directory.Packages.props	Removed global AWS CloudFront package versions.

Comments suppressed due to low confidence (2)

src/tooling/docs-assembler/Cli/DeployCommands.cs:138

• [nitpick] The variable name cloudFrontClient could be misleading since this is a proxy. Consider renaming it to kvsProxy or cloudFrontKvsProxy for clarity.

		var cloudFrontClient = new AwsCloudFrontKeyValueStoreProxy(collector, new FileSystem().DirectoryInfo.New(Directory.GetCurrentDirectory()));

src/tooling/docs-assembler/Deploying/AwsCloudFrontKeyValueStoreProxy.cs:85

• Returning [] here won’t produce a HashSet<string>. Consider returning new HashSet<string>() to match the method’s return type and avoid a compile-time error.

			return [];