fix(msk-alpha): support any combination of client auth mechanisms

[vdahlberg]

Issue

Closes #28592
Related #22041
Related PR #30307

Reason for this change

MSK clusters should allow any combination of authentication methods as stated for example here.

Description of changes

• Allow any combination of authentication modes
• Change the LogicalId of the bootstrapbroker custom resource since it doesn't really make sense that the first used auth method is used if you have multiple auth methods. This is a behavior change but not breaking, as far as I can tell.
• I did run integrationtests but commit a899ac6 introduced conflicts - and unfortunately I am not able to rerun the integration test. Need help from a maintainer.

Description of how you validated changes

• unit tests
• integration tests
• deploying a small sample stack and "upgrading" it (changing the logical id of the bootstrap broker custom resource)

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

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: f8f4783
• Result: FAILED
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