Fix CustomEndpointTest initialization

[aaron-congo]

Description

Fixes two problems with the Custom Endpoint Plugin integration tests:

• custom endpoints are not allowed with multi-az deployments, so this commit disables the tests for multi-az
• every custom endpoint ID in a given region has to be unique, even between different clusters. Appending a unique string to the custom endpoint IDs should ensure each cluster created for our integration tests has uniquely named custom endpoints

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

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