bug: configFileFormat=yaml broken when using namespaced configuration

[lucabrunox]

Describe the issue

When using fluentbit.configFileFormat=yaml and a Filter resource, the generated namespace filter is done with a toml text which doesn't fit the yaml file, e.g.:

[Filter]
    Name    rewrite_tag
    Match    kube.*
    Rule    $kubernetes['namespace_name'] ^(foobar)$ 1234567789.$TAG false
    Emitter_Name    re_emitted_1234567789
  filters:
    - name: lua
      match: "kube.*"
      script: /fluent-bit/config/containerd.lua
      call: containerd
      time_as_table: true

The bug is here:

fluent-operator/controllers/fluentbitconfig_controller.go

Line 410 in e626f2c

" Rule $kubernetes['namespace_name'] ^(%s)$ %x.$TAG false\n", cfg.Namespace,

To Reproduce

Enable fluentbit.configFileFormat=yaml and then create a Filter resource

Expected behavior

Filter works well when file configuration is in yaml format.

Your Environment

- Fluent Operator version: 3.4.0
- Container Runtime:
- Operating system:
- Kernel version:

How did you install fluent operator?

helm upgrade --install fluent-operator fluent/fluent-operator --set configFileFormat=yaml

Additional context

No response