fix(batch): remove default optimal for arm based instance types and add error checks

[1kaileychen]

Issue # (if applicable)

Closes #31148

Reason for this change

When adding an arm-based instance, optimal instance is set by default which consists of an x86-based instance. This causes errors since arm and x86 instances can't be mixed together.

Description of changes

• useOptimalInstanceClasses is set to false for all arm-based instances
• Throws error when trying to mix x86 and arm instances
  • Case 1: Instantiating the class
  • Case 2: addInstanceClass and addInstanceType functions
• Warning useOptimalInstanceClasses is being set to false for arm-based instances

Description of how you validated changes

• Unit test where optimal doesn't get added for arm-based instances
• Unit tests to display errors when instantiating the class
• Unit tests to display errors when addInstanceClass and addInstanceType is adding mixed instances
• Unit tests to display warning for arm based instances

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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