feat(codebuild): Fleet L2 (aws#29754)

### Issue # (if applicable)

Closes aws#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 aws#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)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*