add missing configuration options to fluentbit chart

[nwsparks]

Issue

n/a

Description of changes

Adds a few missing options from the cloudwatch plugin to the fluentbit chart, see https://github.com/aws/amazon-cloudwatch-logs-for-fluent-bit#plugin-options

Checklist

• Added/modified documentation as required (such as the README.md for modified charts)
• Incremented the chart version in Chart.yaml for the modified chart(s)
• Manually tested. Describe what testing was done in the testing section below
• Make sure the title of the PR is a good description that can go into the release notes

Testing

helm lint passed
helm template fluentbit . --set cloudWatch.defaultLogGroupName=test --set cloudWatch.defaultLogStreamName=test --set cloudWatch.newLogGroupTags="tag1=test\,tag2=test" --validate helm template passed
helm install fluentbit . --set cloudWatch.defaultLogGroupName=test --set cloudWatch.defaultLogStreamName=test --set cloudWatch.newLogGroupTags="tag1=test\,tag2=test" installed and verified in the config map the the desired configurations were present.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.