feat(elbv2): support specifying the weighted_random routing algorithm and enabling anomaly mitigation

[gillesbergerp]

Issue # (if applicable)

Closes #29969.

Reason for this change

Enable anomaly mitigation for target groups.

Description of changes

• Added the weighted_random algorithm type
• Added a property for enabling anomaly mitigation

Description of how you validated changes

Unit 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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[gillesbergerp]

Unfortunately, I am unable to run the integration test. If that could be taken over by someone else, it would be very much appreciated

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to an integration test file and the resulting snapshot.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: ef79da7
• Result: FAILED
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