Stop assuming logical $PATH configurations of end-users

[DennisSchmitz]

We should stop assuming that the user's $PATH is correct when executing stuff from within a conda env. Likewise, we should stop hard-coding software location with shebangs. Usually this functions properly, but when it doesn't, it's a nightmare to debug. Especially since we are now running Jovian on many different hardware setups, different distros, secured environments and even WSL1.

In the next code review we should:

• Add the following before every executable that is performed from within a conda env: ${CONDA_PREFIX}/bin/PROGRAM_NAME
• Remove every shebang and simply specify it with the above syntax when executing the command/script.