chore(iam): migrate oidc handler

[colifran]

This PR moves the oidc handler from aws-cdk-lib to our new centralized location for custom resource handlers in the https://github.com/aws-cdk package.

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[mergify]

⚠️ The sha of the head commit of this PR conflicts with #28052. Mergify cannot evaluate rules on this PR. ⚠️

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 1299567
• Result: SUCCEEDED
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