feat(codebuild): support overflow behavior of fleet

[badmintoncryer]

Issue # (if applicable)

None

Reason for this change

AWS cloudformation supports for configuring overflow behavior for a fleet.

Description of changes

• define FleetOverflowBehavior
• add overflowBehavior prop to fleetProps

Describe any new or updated permissions being added

None

Description of how you validated changes

Add both unit and integ tests

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

This pull request has been removed from the queue for the following reason: pull request dequeued.

Pull request #35480 has been dequeued. Mergify failed to merge the pull request. GitHub can't merge the pull request after 15 retries.
Waiting for the branch protection required status checks to be validated.

You can check the last failing draft PR here: #35620.

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.
If you do update this pull request, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[badmintoncryer]

@mergify update

[mergify]

update

✅ Branch has been successfully updated

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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