Added support for @backstage/integration-aws-node for request authentication

What does this PR do?

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

Enable declarative configuration for the module instead writing the extension class directly in the packages/backend/src/index.ts see.

example:

// packages/backend/src/index.ts

backend.add(import('@aws/plugin-scaffolder-backend-aws-apps-for-backstage')

Motivation

The main objective is to decouple AWS Harmonix plugins with the opa-plaform provisioning requirements and enable to run Harmonix in vanilla Backstage app (see: https://github.com/alithya-oss/backstage-plugins/tree/main/workspaces/aws ).

Added API report yarn build:api-reports:only
Applied Prettier code formatting yarn prettier write
Fix repo yarn fix --publish

For Moderators

[x] Compile, build, tests successful before merge?

Additional Notes

Relates to issues #116 and #122 issues.

awslabs / harmonix