Upgrade aws-sdk v2 to @aws-sdk/client-s3 v3

[AnkitSegment]

Summary

• Migrate scripts/upload-assets.js from the monolithic aws-sdk v2 to the modular @aws-sdk/client-s3 v3 package
• Reduces devDependency footprint by only installing the S3 client module instead of the entire AWS SDK
• Pin to @aws-sdk/client-s3@3.722.0, the last version supporting the repo's Node 16 runtime

Changes

scripts/upload-assets.js

• Replace require('aws-sdk/clients/s3') with const { S3Client, PutObjectCommand } = require('@aws-sdk/client-s3')
• Use new S3Client({ region, credentials: { ... } }) instead of new S3({ accessKeyId, secretAccessKey, sessionToken, region })
• Replace s3.putObject(params).promise() with s3.send(new PutObjectCommand(params)) throughout (putObject helper + 2 manifest uploads)

package.json

• Replace "aws-sdk": "^2.760.0" with "@aws-sdk/client-s3": "3.722.0" in devDependencies

Test Screenshot

The uploadAssets function is used by makefile, when it calls new version of build get uploaded in s3.
Staging commit hash SHA: 532ade6
CDN link: https://cdn.segment.build/next-integrations/manifest-532ade6.json

S3 file update.

Test plan

• node -c scripts/upload-assets.js — syntax check passes
• SDK v3 imports and instantiation verified at runtime on Node 16.20.2
• S3Client, PutObjectCommand, and client.send() all functional
• yarn test passes (no integration tests affected — this is a build-only script)
• All PutObjectCommand parameters (Bucket, Key, Body, ContentType, GrantRead, GrantFullControl, ContentEncoding, CacheControl) are identical between v2 and v3 APIs

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