Iankhou gen2 migration codebuild e2e cleanup#14791

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iankhou wants to merge 12 commits intogen2-migrationfrom

iankhou-gen2-migration-codebuild-e2e-cleanup

Commits on Apr 20, 2026

fix: credentials expire after tests but before cleanup
iankhou
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fix: s3 buckets are not empty on deletion attempts during cleanup
iankhou
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fix: custom resources referring to moved gen1 resources fail to delete
iankhou
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fix: deleting gen2 app before gen1 app can cause custom resource deletion failure in gen1
iankhou
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feat: --roleArn option to run the gen2-migration E2E tests, to allow credential refresh in CI
iankhou
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fix: cleanup was using wrong credentials
iankhou
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fix: test credential role-chaining failure
iankhou
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fix: custom auth trigger lambda was not deleted in teardown
iankhou
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