Migrate from AWS SDK Go v1 to v2

[Copilot]

Migrates all AWS SDK usage from github.com/aws/aws-sdk-go v1 to github.com/aws/aws-sdk-go-v2.

Changes

Dependencies

• github.com/aws/aws-sdk-go-v2/config for session configuration
• github.com/aws/aws-sdk-go-v2/service/s3 for S3 operations
• github.com/aws/aws-sdk-go-v2/service/s3/types for S3 type definitions

Session initialization

// Before
sess := session.New()
s3Client := s3.New(sess, nil)

// After
cfg, err := config.LoadDefaultConfig(context.TODO())
if err != nil {
    log.Fatal(err)
}
s3Client := s3.NewFromConfig(cfg)

S3 API calls

• All methods now require context.Context as first parameter
• Direct pointer assignment replaces aws.String() helpers
• Client type changed from *s3.S3 to *s3.Client
• ACL type changed from string to types.ObjectCannedACL

Environment variables (S3_BUCKET, S3_ACL, etc.) remain unchanged.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update from AWS SDK Go v1 to AWS SDK Go v2</issue_title>
<issue_description>Please update all usages of github.com/aws/aws-sdk-go v1 in this repo to github.com/aws/aws-sdk-go-v2.

Migration includes updating when AWS sessions are created, e.g.

before:

after:

Also using service-specific modules like github.com/aws/aws-sdk-go-v2/config and github.com/aws/aws-sdk-go-v2/feature/ec2/imds
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update from AWS SDK Go v1 to AWS SDK Go v2 #1

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