I was doing some debugging with PYENV_DEBUG=1 and noticed that a lot of
work was being done in conda.bash, even though I had not installed any
conda versions like `mambaforge`.
The solution is pretty simple, put all the code inside an if-block.
This aligns with what @varikin found in his pull request #3037
Additionally, I have refactored the code slightly for readability
(created function `build_conda_exclusion_list`), and added comments
which should make it easier to understand what's going on.
This commit simplifies debugging and should reduce the execution time of
```bash
eval "$(pyenv init -)"
```
slightly.
09fbed1d4f