feat(ecs-patterns): pidmode option for fargate services

[noseworthy]

Issue

Closes #31412.

Reason for this change

pidMode is an option of FargateTaskDefinition, but this was not exposed by FargateTaskDefinition which allows users to provide options for the FargateTaskDefinition that is created as part of a *FargateService when the taskDefinition property is excluded. If a user wanted to set the pidMode for their fargate tasks, it would require creating a separate FargateTaskDefinition construct and passing it to the *FargateService pattern.

Description of changes

This change exposes this option directly so that users can specify a pidMode for their tasks without having to construct a separate FargateTaskDefinition. The associated
runtimePlatform.operatingSystemFamily property which is required to be set to ecs.OperatingSystemFamily.LINUX when using pidMode was already exposed.

Description of how you validated changes

Added unit tests to ensure that the generated templates included the specified PidMode property. I've neglected to include integration tests, as I figured that the underlying FargateTaskDefinition constructs are already sufficiently tested.

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

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[noseworthy]

Exemption Request

Is it possible to get an exemption request for the integration test? This option already exists in the underlying constructs, and this PR just exposes it for convenience to the constructs in aws-ecs-patterns. Presumably if this change generates a valid FargateTaskDefinition as tested by the unit test, the existing integration tests for FargateTaskDefinition should cover this? Thanks for your consideration!

[aws-cdk-automation]

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[aws-cdk-automation]

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