make alias name immutable

[rushmash91]

Closes: aws-controllers-k8s/community#1405 (comment)

Description of changes:

• make alias name immutable, required for DeleteAlias call

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@rushmash91: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
lambda-verify-attribution	fb6884f	link	false	/test lambda-verify-attribution
lambda-metadata-file-test	fb6884f	link	true	/test lambda-metadata-file-test
lambda-unit-test	fb6884f	link	true	/test lambda-unit-test
lambda-recommended-policy-test	fb6884f	link	true	/test lambda-recommended-policy-test
lambda-kind-e2e	fb6884f	link	true	/test lambda-kind-e2e
lambda-release-test	fb6884f	link	true	/test lambda-release-test

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