Closes#3385. The bug is that ininstall_environment(), the env patch was not applied in the following snippet:

with_r_code_in_tempfile(r_code_inst_environment)asf:cmd_output_b(_rscript_exec(),'--vanilla',f,cwd=env_dir)

The existing_execute_vanilla_r_code_as_script() abstracting away

1. the application of env patch and
2. the writing inline code to file and executing there (sinceinline execution lead to parser failures)

was only suitable to execute R codeafter the environment has been installed and was for that reason not used when the renv environment was set up initially.
Hence, the approach I took was to factor out_execute_r() that does 1. and 2. and can be parametrised as far as CLI options passed to R go, so it can be used to create the environment itself (_execute_vanilla_r()) and also later to run R code in it (_execute_r_in_renv(), previously named_execute_vanilla_r_code_as_script()).