feat: [telegraf-operator] add support for disabling the flag --enable-default-internal-plugin

[paulojmdias]

• add support for disabling the flag --enable-default-internal-plugin
• [X] Rebased/mergable
• [X] Tests pass
• [X] Sign CLA (if not already signed)

[paulojmdias]

@powersj @srebhan @alespour @jeffreyssmith2nd @mkmik can someone take a look?

Sorry for handle everyone, but since I don't see many movements on this repo, I only want to ensure this feature will be reviewed 🙏