fix: FluenBit add-on CW Log group fix

[vara-bonthu]

What does this PR do?

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Motivation

• FluentBit Helm Chart is trying to create a new CW Log Group by default with name /aws/eks/fluentbit-cloudwatch/logs. We are disabling that using set values. Users can enable but its not advisable as this module not configuring the IRSA policies for this log group
• This add-on module provides a better approach for setting up a CloudWatch Log Group for FluentBit while ensuring proper IRSA policies. Users can provide their Log group name, or the module will set it as /${var.cluster_name}/aws-fluentbit-logs if not specified.
• Adds a fix to IAM policy to ensure log stream can be queried without any errors

• Resolves FluentBit Helm add-on throws multiple errors #227

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I ran pre-commit run -a with this PR

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[bryantbiggs]

Thank you!