Add default version of software installed to the $PATH

[bschwedler]

Given that we are installing a specific version of software like Python and R, we should expect that these executables be available in users' PATH by default.

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### Tasks
- [ ] Add default Python executables to `$PATH`
- [ ] Add default R executables to `$PATH`
- [ ] Add default Quarto executables to `$PATH`
- [ ] Examine other software that we install that we want to add to the