Bring back `aiidalab install` to install dependencies by able to specific to global conda environment

In https://github.com/aiidalab/aiidalab-qe/pull/562, I revert the install of app in container from using `aiidalab install` to `pip install`, since the `aiidalab install` in the backend calls `pip install --user` and install dependencies to `/home/jovyan/.local`. In k8s deployment, the home folder is not bind mounted therefore dependencies will all lost.
The way to solve it should happen in `aiidalab install` by adding an option to the command allow to install in conda folder globally therefore not lost files after mound for user pods.