fix: Implement graceful shutdown

[skhalash]

Description

Changes proposed in this pull request (what was done and why):

• Implement graceful shutdown
• Improve error handling - use errors and log them instead of panics
• Improve logger creation
• Fix docker warning

Changes refer to particular issues, PRs or documents:

• LogPipeline AgentHealthy status is flaky at agent rollout telemetry-manager#1545

Traceability

• The PR is linked to a GitHub issue.
• The follow-up issues (if any) are linked in the Related Issues section.
• If the change is user-facing, the documentation has been adjusted.
• If a CRD is changed, the corresponding Busola ConfigMap has been adjusted.
• The feature is unit-tested.
• The feature is e2e-tested.