fix: dynamically search for instance classes that have enough availability zones in the region

[karenc-bq]

Summary

Dynamically search for an instance class that has enough availability zones for multi-az integration tests instead of using a hard coded option.

Description

The number of availability zone for each instance class and storage type combination changes due to availability on the service side.
We cannot use a hard coded storage type and instance class.

There isn't a way to determine whether the instance class supports mullti-az db clusters using the SDK, so we need to try the options one by one. For instance, querying the instance class db.m6g.16xlarge using DescribeOrderableDbInstanceOptionsRequest indicates the instance is multi-az capable (multiAZCapable == true), but attempting to create a cluster with engine version 17.2 throws the following exception:

software.amazon.awssdk.services.rds.model.RdsException: The combination of engine version 17.2 and DB instance class db.m6g.16xlarge isn't supported for Multi-AZ DB clusters.

Integration test runs:

• https://github.com/aws/aws-advanced-jdbc-wrapper/actions/runs/15192693170
• https://github.com/aws/aws-advanced-jdbc-wrapper/actions/runs/15192714128

Additional Reviewers

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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It seems all right 👌

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