feat: Reduced resource requests for several components

[a-thaler]

Description

• After checking the idle consumptions, I reduced the CPU request for
  • fluentbit exporter from 100m to 10m
  • self-monitor from 100m to 10m
• After checking the idle consumptions, I reduced the memory request for
  • fluentbit exporter from 50m to 20m
  • manager from 100m to 50m

Changes refer to particular issues, PRs or documents:

• Load test for prometheus changes: https://github.com/kyma-project/telemetry-manager/actions/runs/11366151905

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.

[skhalash]

Let us merge it after #1527 is merged