### What changes were proposed in this pull request?
CRAN check fails due to the size of the generated PDF docs as below:
```
...
WARNING
‘qpdf’ is needed for checks on size reduction of PDFs
...
Status: 1 WARNING, 1 NOTE
See
‘/home/runner/work/spark/spark/R/SparkR.Rcheck/00check.log’
for details.
```
This PR proposes to install `qpdf` in GitHub Actions.
Note that I cannot reproduce in my local with the same R version so I am not documenting it for now.
Also, while I am here, I piggyback to install SparkR when the module includes `sparkr`. it is rather a followup of SPARK-32491.
### Why are the changes needed?
To fix SparkR CRAN check failure.
### Does this PR introduce _any_ user-facing change?
No, dev-only.
### How was this patch tested?
GitHub Actions will test it out.
Closes#29306 from HyukjinKwon/SPARK-32497.
Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>
32f4ef005f