Updates to SAM templates and minor updates to Chroma Key function

[pbraz-aws]

Issue #, if available:

Description of changes:

SAM Templates:

• Moved architecture, runtime, handler, and env variable specification to globals section for templates that have more than one lambda function. This will make specifically updating the runtime easier in the future.
• Modified the UpdateRides policies to use the SAM managed policy template SNSPublishMessagePolicy.
  • https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-template-list.html#sqs-publish-message-policy
• Updated DDBtable to be a SimpleTable to simplify IAC definition.
  • https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-resource-simpletable.html
• Changed DynamoDB tables to use OnDemand billing mode due to recent changes in DynamoDB pricing.
  • https://aws.amazon.com/blogs/database/new-amazon-dynamodb-lowers-pricing-for-on-demand-throughput-and-global-tables/
  • https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/capacity-mode.html#:~:text=On%2Ddemand%20mode%20is%20the%20default%20and%20recommended%20throughput%20option%20for%20most%20DynamoDB%20workloads.
• Set bucket policy to DenyInsecureTransport on the FinalBucket
• Removed explicit memory specification if Lambda function used 128 since that is the default.
  • https://docs.aws.amazon.com/lambda/latest/dg/configuration-memory.html#configuration-memory-use-cases

Chroma key Lambda Function:

• Removed print statements to standardize on the logging module to use logging module and f-strings.
• Removed redundant s3_client local reference
• Improved error messaging
• Code formatting & type annotations

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