Feature request: Add Node.js 26 support - CodeBuild

Please add support for `nodejs` runtime version `26` for at minimum the `standard` + `amazonlinux` images. Node.js 26 was [released](https://nodejs.org/en/blog/release/v26.0.0) on 2026-05-05.

**Notable changes in Node.js 26:**
- V8 engine updated to v14.6 (NODE_MODULE_VERSION 147)
- Stable TypeScript support (no longer requires --experimental-transform-types)
- Temporal API enabled by default

**Related issues in other AWS services:**
- Lambda base image: aws/aws-lambda-base-images#488

Based on use-cases, it would be great if the support could be scheduled together (more or less) with other AWS services – this enables us to use different AWS services smoothly together.

If you're also waiting for this, please 👍 this issue.

Start by locating the CodeBuild image definitions for the `standard` and `amazonlinux` images, then inspect how existing `nodejs` runtime versions are declared. Confirm that version 26 is available in the requested images and verify the affected image builds or runtime checks before considering the issue complete.

Written by the indexing model from the issue text.