DMVP-6036: have flagger notify/alerts configure ability

[mrdntgrn]

No description provided.

[what-the-diff]

PR Summary

• Improved Configuration Options in README Files
  Our documentation in README.md and example README files is updated to reflect changes in our software. This includes supplemental config options for flagger and updated version information for provider_aws. This is designed to improve clarity and ease of use for the user.

• Enhanced Rollout Trigger Configuration
  The http-echo-canary-eks.yaml file is now enriched with an upgraded rollout trigger configuration. This change is expected to offer more control over how software releases are triggered in our project.

• Updated Helm Release
  We've updated the Helm release versions in the eks-with-flagger/1-example.tf file, ensuring that we're using the latest and most stable versions of our dependencies.

• Renamed and Enhanced Metrics and Alerts
  We've renamed and updated the Helm release for metrics and alerts in the modules/flagger/metric-template.tf file. The change from flagger_metric_template to flagger_metrics_and_alerts should simplify the understanding of the function.

• Updated Method with New Metrics and Alerts Configs
  We've modified the method in modules/flagger/variables.tf to include the new metrics and alerts configs, increasing the flexibility and usefulness of these parameters.

• Enhanced Descriptions for Input Variables
  Description for input variables in modules/flagger/README.md and variables.tf have been enhanced for better understanding and accuracy regarding configs and metrics_and_alerts_configs. This aims to be of tremendous help for users to comprehend and utilize these variables accurately.