### Issue # (if applicable) Closes #29617. ### Reason for this change Implementation of reserved capacity CodeBuild projects ### Description of changes * Add Fleet Construct * Add `EnvironmentType` enum * Refactor existing type strings to use the new enum * Validate that Windows 2022 build images can only be used in fleet projects Changes merged from #29616: * Added missing build images * Updated JSDoc comments to indicate AL2023 based images, see [docs](https://docs.aws.amazon.com/codebuild/latest/userguide/build-env-ref-available.html) * It might be a good idea to deprecate and rename `AMAZON_LINUX_2_STANDARD_3_0` to `AMAZON_LINUX_2023_STANDARD_3_0`, despite how the images are named. I'll leave it up to the maintainers * Added `{@link}` tags where missing ### Description of how you validated changes Unit and integ tests The images were retrieved using the [codebuild:ListCuratedEnvironmentImages](https://docs.aws.amazon.com/codebuild/latest/APIReference/API_ListCuratedEnvironmentImages.html) API command, and comparing it to the CDK. ### Checklist - [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md) ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*