[ENHANCEMENT]: [fj-doc-maven-plugin] add variables to 'direct' goal

### Enhancement type

Improvements of existing feature

### Do you want to contribute?

all

### Goal of the proposal

Add variables to quarkus-version set to 3.21.1 across all the modules

### Brief description

[fj-doc-maven-plugin] add variables to 'direct' goal

### Detailed description

[fj-doc-maven-plugin] add variables to 'direct' goal

### Is a proof of concept available

_No response_