chore: Updates package aws-sdk-go to aws-sdk-go-v2 - follow up

[maastha]

Proposed changes

Jira ticket: CLOUDP-339863

This PR is a follow-up to #1467

Link to any related issue(s):

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update
• If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Manual QA performed:

• cfn invoke for each of CRUDL/cfn test
• Updated resource in example
• Published to AWS private registry
• Used the template in example to create and update a stack in AWS
• Deleted stack to ensure resources are deleted
• Created multiple resources in same stack
• Validated in Atlas UI
• Included screenshots

Required Checklist:

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• For CFN Resources: I have released by changes in the private registry and proved by change
  works in Atlas

Further comments

[maastha]

Organization contract test failure is flaky, this has been validated locally.

[Copilot]

Pull request overview

This PR completes the migration from AWS SDK Go v1 (aws-sdk-go) to AWS SDK Go v2 (aws-sdk-go-v2) across CloudFormation resources. The changes update import paths, API call patterns, and error handling to align with SDK v2 conventions.

Key Changes:

• Updated AWS SDK imports from v1 to v2 across all resource handlers
• Modified API calls to use context-based patterns (e.g., CreateSecret(context.Background(), input))
• Converted error code handling from constants to string conversions (string(types.HandlerErrorCode...))
• Updated helper utility functions for AWS service client creation

Reviewed changes

Copilot reviewed 53 out of 54 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
cfn-resources/x509-authentication-database-user/cmd/resource/resource.go	Updated error handling to use SDK v2 types and refined nil pointer checks
cfn-resources/util/secrets/secret_manager.go	Migrated AWS Secrets Manager client initialization to SDK v2 with context support
cfn-resources/util/aws/utils.go	Refactored EC2 client creation and VPC endpoint operations for SDK v2 compatibility
cfn-resources/trigger/cmd/resource/resource.go	Replaced SDK v1 string utilities with SDK v2 equivalents
cfn-resources/search-index/cmd/resource/resource.go	Updated error codes and operation status handling to SDK v2 patterns
cfn-resources/profile/profile.go	Added documentation explaining SDK v2 credential handling in CloudFormation context
cfn-resources/private-endpoint/cmd/resource/steps/awsvpcendpoint/aws_vpc_endpoint.go	Migrated EC2 VPC endpoint operations to SDK v2
cfn-resources/go.mod	Reorganized dependencies to properly reflect SDK v2 as primary dependency
Multiple test shell scripts	Fixed indentation inconsistencies in shell scripts
Multiple resource handlers	Systematically converted error codes to SDK v2 string format

Comments suppressed due to low confidence (1)

cfn-resources/online-archive/test/cfn-test-create-inputs.sh:1

• The --mdbVersion 5.0 parameter was removed from the cluster creation command. If a specific MongoDB version is required for testing, this parameter should be retained to ensure consistent test environments.

#!/usr/bin/env bash

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[manupedrozo]

Not merging #1495 and #1496 to avoid conflicts in this PR