Add jobs that trigger on file upload

[lorenyu]

Ticket

Resolves #522

Changes

• Refactor service name and bucket name to env-config module
• Add file_upload_jobs config to env-config module
• Update service module to add event rule and target to trigger jobs based on file uploads
• Add role and policy that EventBridge will use to run ECS tasks
• Document background job functionality

Example app changes

• Add etl command to example Flask app
• Add etl job to file_upload_jobs config for platform-test

CI changes

• Bump terraform version in ci-infra-service workflow

Fixes

• Fixed storage access permissions to have kms:Decrypt

Unrelated changes

• Moved feature flags config to separate file in same module

Context for reviewers

Many applications need a basic ETL system that ingests files that are uploaded to a bucket. This change adds that functionality.

Testing

Developed and tested on platform-test in navapbc/platform-test#81

Ignore the anchor scan failure since it's in the example app and I don't want to add an ignore rule to the template anchor scan config.

[daphnegold]

Everything looked good to me except where I got very stuck trying to understand what's going on with the input_transformer. 🥇

[charles-nava]

Nice work!