feat: update to aws-sdk-go-v2

[BATMAN-JD]

What is being added?

1. Dependencies

• Migrated from github.com/aws/aws-sdk-go (v1) to github.com/aws/aws-sdk-go-v2
• Added github.com/aws/smithy-go for error handling
• AWS SDK v1 completely removed from dependencies

2. API Signatures

• Added context.Context as first parameter to all AWS API calls
• Updated client initialization from session.NewSession() to config.LoadDefaultConfig()

3. Type System

• AWS types moved to separate packages (iamtypes, organizationstypes, ec2types, etc.)
• Slice types changed from pointers to values: []*Type → []Type
• Boolean fields changed from pointers to values: *bool → bool
• String constants changed to typed enums (e.g., aws.String("ACCOUNT") → organizationstypes.ChildTypeAccount)
• Integer types updated where required: aws.Int64() → aws.Int32()

4. Error Handling

• Replaced awserr.Error with smithy.APIError
• Updated error checking from type assertions to errors.As() pattern

5. Tests

• Updated all mock expectations with gomock.Any() for context parameters
• Fixed test assertions for v2 SDK error types
• All unit tests passing (100% success rate)

What Stayed the Same

• ✅ Zero functional changes - all business logic identical

• ✅ Same AWS operations performed

• ✅ Same error handling behavior (different types, same logic)

• ✅ No API endpoint changes

• ✅ No configuration changes required for deployments

• I have tested this locally

• I have included unit tests

• I have updated any corresponding documentation

Steps To Manually Test

Please provide us steps to reproduce the scenarios needed to test this. If an integration test is provided, let us know how to run it. If not, enumerate the steps to validate this does what it's supposed to.

1. Start the operator
2. Run the thing
3. Observe X in the spec for the thing
4. Clean up the thing

SREP-1187

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