C++ Legacy Cleanup

[beqqrry-aws]

Sub-Issues

• [x] #3462
• [ ] Create issue list of services in need up cleanup based on the C++Tech debt file

Each service will need the following tasks:

• [ ] Update or add Readmes based on current templates
• [ ] Confirm code works as intended
• [ ] Add to SoS and update snippets to current standards
• [ ] Update code comments
• [ ] Fully lint code
• [ ] Delete useless or duplicate code and ensure there are no external links to it
• [ ] Create and/or fix tests as required

List of services:

• [x] #5596
• [x] #6220
• [ ] cloudwatch
• [ ] cloudwatch-logs
• [x] #6378
• [ ] codecommit
• [x] #3584
• [ ] ebs
• [x] #3586
• [ ] efs
• [ ] elasticcache
• [ ] elasticfilesystem
• [ ] eventbridge
• [ ] gamelift
• [ ] glacier
• [ ] guardduty
• [x] #3548
• [ ] kinesis
• [x] #3585
• [ ] neptune
• [ ] redshift
• [ ] #4438
• [x] #3538
• [ ] s3encryption
• [x] #5091
• [x] #4497
• [x] #4739
• [ ] transfer-manager