serverside: Add awssdk query parameter to the s3 url
Go CDK v0.39.0 defaults to AWS SDK v2, introducing a token bucket rate limiting mechanism that can cause unexpected behavior. This commit adds 'awssdk=v1' to S3 URLs as a temporary workaround. The upcoming Go CDK v0.40.0 will default to no rate limiting unless explicitly defined, resolving this issue.
Closes #6417