Have SSM generate and inject passwords

[giusedroid]

Have SSM generate and inject passwords

As of now, the user is expected to generate and add passwords to the environment of their CI/CD pipeline.
It would be better to have AWS SSM SecretManager with CloudFormation, as showed here

Acceptance Criteria

• the value of parameter GrafanaDatabasePassword in cloudformation/10-aurora-backend.yml must be generated and managed by SSM SecretManager
• the value of parameter GrafanaServiceAdminPassword in cloudformation/20-grafana-ecs-service.yml must be generated and managed by SSM SecretManager
• the value of parameter GrafanaDatabasePassword in cloudformation/20-grafana-ecs-service.yml must be resolved via SSM SecretManager
• DO NOT CHANGE USER NAME FOR THE DATABASE please