[SPARK-29378][R][FOLLOW-UP] Remove manual installation of Arrow depen…

…dencies in AppVeyor build

### What changes were proposed in this pull request?

This PR remove manual installation of Arrow dependencies in AppVeyor build

### Why are the changes needed?

It's unnecessary. See #26555 (comment)

### Does this PR introduce any user-facing change?

No

### How was this patch tested?

AppVeyor will test.

Closes #26566 from HyukjinKwon/SPARK-29378.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

appveyor.yml

@@ -43,7 +43,6 @@ install:
   - ps: .\dev\appveyor-install-dependencies.ps1
   # Required package for R unit tests
   - cmd: R -e "install.packages(c('knitr', 'rmarkdown', 'e1071', 'survival', 'arrow'), repos='https://cloud.r-project.org/')"
-  - cmd: R -e "install.packages(c('assertthat', 'bit64', 'fs', 'purrr', 'R6', 'tidyselect'), repos='https://cloud.r-project.org/')"
   # Here, we use the fixed version of testthat. For more details, please see SPARK-22817.
   # As of devtools 2.1.0, it requires testthat higher then 2.1.1 as a dependency. SparkR test requires testthat 1.0.2.
   # Therefore, we don't use devtools but installs it directly from the archive including its dependencies.