Complete the exts_list to avoid missing deps issues

[macheitor]

Completes the exts_list for R packages adding dependencies on top of the extensions to avoid build issues.
Extensions installed by dependencies or build_dependencies are ignored.
Blacklisted extensions, such as base R packages, are ignored too.

Steps for development:

git clone -b easybuild-update-integration https://github.com/HPCNow/easybuild-framework_2024.git
cd easybuild-framework_2024
python3 -m venv .venv
. .venv/bin/activate
pip install -r requirements.txt
pip install easybuild-easyblocks easybuild-easyconfigs
pip install -e .
python3 easybuild/main.py "your-eb-recipie-path" --check-installed-exts