feat: Add `is_quarto_project` criterion

[olivroy]

Fix #91 This PR also fixes some warnings with mockr.

Note that I was not able to load with load_all() on Windows

<error/rlang_error>
Error in `pkgload::load_all()`:
! Namespace for rprojroot can't already exist.
---
Backtrace:
    ▆
 1. └─pkgload::load_all()
 2.   └─pkgload:::create_ns_env(path)
 3.     └─cli::cli_abort(...)
 4.       └─rlang::abort(...)

Edit: I also forgot to create this PR from a branch..

Reference: https://quarto.org/docs/projects/quarto-projects.html

[krlmlr]

My last action probably messed up your local clone, fix with git fetch && git rebase .

[olivroy]

It is fine. Does the implementation look ok to you?

[krlmlr]

Thanks, looks good! I'll merge the next time I work on this package.

[aviator-app[bot]]

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[aviator-app[bot]]

This pull request failed to merge: PR cannot be automatically rebased, please rebase manually to continue. Remove the blocked label to re-queue.

Additional debug info: Failed to rebase this PR onto the latest changes from the base branch. You will probably need to rebase this PR manually and resolve conflicts).