bug: Issue with imagePullSecrets for fluentbit

[g1franc]

Describe the issue

Issues is about specifying image pull secret in fluentbit-fluentBit.yaml template
It is using an Helm "if" instead of a "with", it lead to output the full content of the values when later using "toYaml . "

To Reproduce

Set a imagePullSecrets for FluentBit via .Values.fluentbit.imagePullSecrets

It will output the full values in the produced yaml

Expected behavior

It should only output the part related to the imagePullSecrets for fluentbit and not the full values of the helm chart.

Your Environment

- Fluent Operator version: 3.4.0
- Container Runtime: N/A
- Operating system: N/A
- Kernel version: N/A

How did you install fluent operator?

Using helm template then apply the output of the generation.

Additional context

No response

[g1franc]

Faulty commit : 167eb53#diff-76ae90b2c504f560452cc8baeed4ac3b9a53dc2eaae4164ccaec564207dfbfb9

[g1franc]

Create PR for #1636