AWS Secrets Manager CI Backend

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What does this MR do and why?

Add AWS Secretsmanager CI Schema

So its available to use AWS Secretsmanager in the GitLab CI Configuration

Changelog: added EE: true

References

resolves #542345 (closed) corresponding runner MR: gitlab-runner!5587 (merged) its not blocking as we raised another mr just for the ci schema json to be non breaking: !191905 (merged)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Enable FF ci_aws_secrets_manager
2. Configure your .gitlab-ci.yml file with the following example:

# Simple configuration example
build-job:
  # Define ID token for OIDC authentication with AWS
  id_tokens:
    MY_TOKEN:
      aud: https://sts.amazonaws.com
  
  # Define AWS secrets to be retrieved
  secrets:
    DATABASE_PASSWORD:
      aws_secrets_manager: 'your-secret-id#field-name'
      token: $MY_TOKEN
      file: false  # Optional: set to false to store value directly in variable
  
  # Environment variables (can be set at project/group level)
  variables:
    AWS_REGION: eu-central-1 # required
    AWS_ROLE_ARN: 'arn:aws:iam::123456789123:role/your-role-name' # optional
  
  stage: build
  script:
    - echo "Accessing secret..."
    - echo "Secret retrieved successfully: $DATABASE_PASSWORD"

2. Since this MR doesn't include the CI YAML schema updates, you'll need to manually apply changes from MR #191905 to your local development environment.

3. For end-to-end testing, use the associated [runner changes MR](gitlab-runner!5587 (merged)

) to see the feature working completely.

4. Ensure your AWS IAM role has appropriate permissions to access the secrets in AWS Secrets Manager.

MR acceptance checklist

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