Chore: Update GitHub actions to use assumed role

[krisrjohnson21]

Summary of changes

Asana Ticket: Update application repos to use the new version of the GitHub action(s) (v2 tag)

This PR updates the deploy workflow to use v2 of the shared build-push-ecr and deploy-ecs actions. These updated actions assume an IAM role instead of relying on long-lasting AWS keys for an IAM user.

Note there are still workflow uses in this repo, those will be addressed as part of a follow-up subtask.

Reviewer Checklist

• This branch was deployed to the staging environment and is currently running with no unexpected increase in warnings, and no errors or crashes (compare on Splunk: staging vs. prod)

[github-actions]

Coverage of commit b3ca1b3

Summary coverage rate:
  lines......: 74.3% (2015 of 2712 lines)
  functions..: 79.8% (557 of 698 functions)
  branches...: no data found

Files changed coverage rate: n/a

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