Backend: Add support for `@backstage/integration-aws-node`

[fjudith]

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What is the outcome that you are trying to reach?

The backend plugin currently relies on implicit AWS credentials provided by the either by the AWS CLI (local dev/ec2) or ECS Fargate (deploy), meaning that Harmonix cannot be easily used in a existing vanilla Backstage app.

Describe the solution you would like

Implement @backstage/integration-aws-node to standardise the AWS credentials configuration with other AWS integrated plugins like:

• RoadHQ plugins
• AWS Codestart plugins

Describe alternatives you have considered

None

Additional context

Tasks

Preview Give feedback

1. Implement @backstage/integration-aws-node in aws-apps-backend plugin
2. Implement @backstage/integration-aws-node in scaffolder-backend-module-aws-apps plugjn
3. Check and fix missing repo yarn backstage-cli repo fix --check --publish
4. Validate configuration files yarn backstage-cli config:check --lax
5. Check types and declarations yarn tsc
6. Prettier yarn prettier --write .
7. Generate api reports yarn build:api-reports
8. Lint yarn backstage-cli repo lint --since origin/main
9. Test packages yarn backstage-cli repo test --coverage --maxWorkers=3
10. Update doc to reference AWS integration configuration described in @backstage/integration-aws-node dependency

[fjudith]

We already implementd this feature in separated private repository and are open to submit a PR