MLE-23597: fluent-bit config changed to use YAML format

[barkhachoithani]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates fluent-bit configuration from the legacy .conf format to the modern YAML format. The change improves maintainability and aligns with fluent-bit's current recommended practices.

• Updated fluent-bit container command and arguments to use YAML config file
• Converted configuration files from .conf format to .yaml format with proper YAML structure
• Enhanced output configuration processing with intelligent indentation handling for user-defined YAML

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
pkg/k8sutil/statefulset.go	Added explicit command and args to use fluent-bit.yaml config file
pkg/k8sutil/configmap.go	Converted fluent-bit configuration generation from .conf to .yaml format with improved output processing

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