Update R Tester to allow renv.lock file upload

[soheegoo]

Description:

• Users can provide package dependencies for the R autotester environment by uploading a renv.lock file in addition to manually listing dependencies (existing functionality)

Changes:

• Updated json schema to include checkbox where users specify if renv.lock file has been uploaded
• When creating the testing environment, an R script will install the packages in the renv.lock file using renv library if the user chooses

Testing procedure:

• Rebuild schema
• Upload dependencies through renv.lock file and click checkbox, manually list package requirements, or both
• Save the R Automated Test setttings
• Run a submission for R assignment to see if successful

Tests Conducted:

• Uploading one dependency through all use cases: knitr package was 1) entered manually as a package requirement, 2) specified through a renv.lock file, and 3) uploaded through both methods at the same time
• Uploading multiple dependencies through both methods combined: renv.lock file (knitr package) and manual input (plotly package)