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GH-45536: [Dev][R] Update code to match new linters on lintr=3.2.0 (#45556)

### Rationale for this change

CI jobs failing with lintr >= 3.2.0

### What changes are included in this PR?

Remove some comments and update some lintr config to ensure compatibility with lintr package version 3.2.0

### Are these changes tested?

Nope

### Are there any user-facing changes?

Nope
* GitHub Issue: #45536

Authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>