Real redirects support

[cotti]

This MR is part of https://github.com/elastic/docs-eng-team/issues/135.

In order to have "real redirects", we need to provide a redirect mapping to CloudFront's KeyValueStore. CloudFront in turn will use it as it handles requests, determining passthrough or redirection.

• docs-assembler repo build-all now outputs a redirects.json file with the compiled mappings. It outputs the path to this file to Github's CI under redirects_artifact_path.

• docs-assembler received a new command: deploy update-redirects. It will be called on CI during deployment, access the redirects mapping artifact from repo build-all, access the KeyValueStore, determine which redirects should be added, kept or deleted, and perform batch operations.

  • The current amount of unique redirects still lie well below the limit provided, so we still have some leeway.

[Copilot]

Pull Request Overview

This PR adds support for real redirects by generating a redirects.json artifact during build and updating CloudFront’s KeyValueStore during deployment.

• New package references for CloudFront and its KeyValueStore in the csproj.
• Enhancements in CLI commands: outputting the redirect artifact during build and adding a deploy command to update redirects in CloudFront.
• Integration of redirects output within the assembler builder and serialization support enhancements.

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	Added package references for AWS CloudFront and CloudFrontKeyValueStore.
src/tooling/docs-assembler/Cli/RepositoryCommands.cs	Outputs the path of the generated redirects.json artifact to GitHub Actions.
src/tooling/docs-assembler/Cli/DeployCommands.cs	Introduces a new command to update redirects in CloudFront’s KeyValueStore using batch operations.
src/tooling/docs-assembler/Building/AssemblerBuilder.cs	Adds logic to output redirects.json and filter duplicate redirect entries.
src/Elastic.Documentation/Serialization/SourceGenerationContext.cs	Updates serialization context to support FrozenDictionary.
Directory.Packages.props	Specifies versions for new AWS SDK package dependencies.

Comments suppressed due to low confidence (1)

src/tooling/docs-assembler/Building/AssemblerBuilder.cs:155

• [nitpick] Consider adding an inline comment explaining why redirects with equivalent keys and values (after trimming trailing slashes) are being filtered out, for clarity.

			.ToFrozenDictionary();

[Mpdreamz]

Some nits but mostly LGTM!