feat(appconfig): add atDeploymentTick extension action point to L2 Constructs

[cpaluch-aws]

Issue # (if applicable)

Not Applicable

Reason for this change

Missing feature for AppConfig Extension Action Point

Description of changes

Added feature and unit tests. Updated Integration tests.

Description of how you validated changes

Unit tests 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

[aws-cdk-automation]

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[aws-cdk-automation]

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❌ Features must contain a change to a README file.
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[aws-cdk-automation]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a9de9d4
• Result: SUCCEEDED
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