feat(ecs-patterns): allow custom ephemeral storage for ECS Fargate services

[daixi98]

Issue # (if applicable)

Closes #18105.

Reason for this change

In April 2021, Fargate added support for requesting additional ephemeral storage.

Support for this feature has been added to the aws-ecs package, but is still not supported by the aws-ecs-patterns package.

Description of changes

This code change adds an optional field ephemeralStorageGiB in packages/aws-cdk-lib/aws-ecs-patterns/lib/base/fargate-service-base.ts, after other fields like cpu and memoryLimitMiB.

Description of how you validated changes

Added unit tests and new integration tests.
Created a simple CDK application with the new constructs, and verified that it synthesized and deployed correctly.

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

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[aws-cdk-automation]

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 7692b16
• Result: FAILED
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