fix fluent conditionals

Currently fluents conditionals are all completely different. MR sets them to all exist on the same condition fluentbit.enabled.

Can definitely make this conditional something else, logging.enabled + fluentbit.enabled for example, just wanted to put this MR out to fix the issue of them being all different - feel free to comment what the correct conditional should be in your opinion :D

chart/templates/logging/fluentbit/fluentbit-helmrelease.yaml

-{{- if .Values.logging.enabled }}
+{{- if .Values.fluentbit.enabled }}
 apiVersion: helm.toolkit.fluxcd.io/v2beta1
 kind: HelmRelease
 metadata: