arrow

GH-38295: [CI][R] Free up disk space for Azure Pipelines jobs (#38302)

### Rationale for this change

test-r-rhub-ubuntu-gcc-release-latest doesn't have enough disk space.

### What changes are included in this PR?

Remove pre-installed files on Azure Pipelines too.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #38295

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>