Removing renv::snapshot from deploy tests

[kgartland-rstudio]

Intent

The deploy tests started failing this week due to running renv::snapshot() prior to deploying. This PR removes the snapshot and uses renv::restore(). The fix was to add deps.R files that load any missing libraries in our content repo.

The nightly tests are passing against this branch here: https://github.com/posit-dev/publisher/actions/runs/9648233701

Type of Change

• • [ ] Bug Fix
• • [ ] New Feature
• • [ ] Breaking Change
• • [ ] Documentation
• • [ ] Refactor
• • [x] Tooling

Approach

Automated Tests

Directions for Reviewers

Checklist

• [ ] I have updated CHANGELOG.md to cover notable changes.