#1945 - Create shared environment file for ECS tasks

[EvanParish]

Description

This PR removes the environment variables from our task definitions and moves them to environment specific files. Each environment file is uploaded to the designated s3 bucket during deployment.

issue #1945

How Has This Been Tested?

• [x] verified the env files are uploaded to S3 when deploying the app
• [x] deployed to dev and the regression passed

Checklist

• [x] I have assigned myself to this PR
• [x] PR has an appropriate title: #9999 - What the thing does
• [x] PR has a detailed description, including links to specific documentation
• [x] I have added the appropriate labels to the PR.
• [x] I did not remove any parts of the template, such as checkboxes even if they are not used
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to any documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works. Testing guidelines
• [x] I have ensured the latest main is merged into my branch and all checks are green prior to review
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules
• [x] The ticket was moved into the DEV test column when I began testing this change